Nuevos registros de aves con alteraciones de color de Ecuador / New records of birds with color alterations from Ecuador

Resumen Reportamos seis nuevos casos de aves silvestres con aberración cromática provenientes de cuatro provincias de Ecuador. Los registros fotográficos provienen de observaciones oportunistas. El presente es el primer registro de plumaje aberrante para Anas bahamensis, Florisuga mellivora, Opisthocomus hoazín, Dendrocincla fuliginosa y Asemospiza obscura; mientras que se suman casos de individuos aberrantes en Turdus fuscater. El caso de F. mellivora es el más relevante por su rareza y evidencia patrones de coloración en la especie. Resaltamos la importancia de documentar y publicar el encuentro de estos eventos.

Abstract We report six new cases of wild birds with chromatic aberration from four provinces of Ecuador. The photographic records come from opportunistic observations. This is the first record of aberrant plumage for Anas bahamensis, Florisuga mellivora, Opisthocomus hoazín, Dendrocincla fuliginosa y Asemospiza obscura; while cases of aberrant individuals are added in Turdus fuscater. The case of F. mellivora is the most relevant due to its rarity and evidence of coloration patterns in the species. We highlight the importance of documenting and publishing the encounter of these events.

Analysis of intercomparison results of national biological dose estimation capability in 2022 / 中华放射医学与防护杂志

Objective:To improve the ability of radiation health technical institutions for biological dose estimation.Methods:A total of 144 institutions nationwide, including the CDC, prevention and treatment center for occupational disease, colleges and universities, scientific research institutes, nuclear industry systems, and medical and physical examination institutions, were organized to carry out the intercomparison of national biological dose estimation capabilities in 2022. The institutions participating in the comparison were divided into two types of A and B, through the identification of chromosome aberrations, to estimate the irradiation dose (A) or chromosome aberration rate (B). The results were summarized and compared, and the main problems were analyzed and discussed.Results:There were 60 institutions in type A, 52 qualified institutions (including 12 excellent institutions) and 8 unqualified institutions, with a pass rate of 86.7% (20.0% excellent) and a failure rate of 13.3%. There were 84 institutions participating in the biological dose estimation comparison of type B, with 48 qualified institutions, and 36 unqualified institutions, the qualified rate was 57.1%, and the unqualified rate was 42.9%.Conclusions:Most of the institutions participating in type A comparison have the ability to estimate biological dose, and more than half of the institutions participating in type B comparison have the ability to analyze chromosome aberration. The overall ability of institutions participating in type A comparison is higher than in type B.

Correlation of corneal biomechanical changes with corneal volume changes and high-order aberration changes in the early stage after small incision lent-icule extraction / 眼科新进展

Objective To observe the corneal biomechanical changes of patients in the early stage after small inci-sion lenticule extraction(SMILE),and to analyze the correlation between the corneal biomechanical changes and changes in corneal volumes and higher-order aberrations.Methods A total of 72 patients(72 eyes)with myopia or myopic astig-matism who were scheduled for SMILE in the Optometric Center of Second People's Hospital of Foshan from January to August 2021 were included.The right eye was selected for observation.Before and 3 months after the SMILE,novel corne-al biomechanical parameters,such as biomechanical intraocular pressure(bIOP),DA ratiomax(2 mm)(DA2 ratio),inte-grated radius(IR),Ambrósio's relational thickness(for evaluation of the morphology and quality of the cornea,ARTh),stiffness parameter applanation 1(SP-A1),Corvis biomechanical index(CBI)and stress-strain index(SSI),were meas-ured by the new generation of Corvis? ST.The Pentacam anterior segment analysis system was used to measure corneal bi-omechanical parameters,including corneal volume(CV3 mm,CV5 mm,CV7 mm and CV10 mm);total root mean square of whole cornea,anterior and posterior corneal surface[RMS(Cornea,CF,CB)];root mean square of high-order aberrations of total cornea,anterior and posterior corneal surface[RMS HOA(Cornea,CF,CB)].Paired t-test or Wilcoxon singed-rank test was used to compare the changes in parameters before and after SMILE.Spearman correlation analysis and partial least squares regression were used to study the correlation between changes in novel corneal biomechanical parameters with cor-neal volume changes and high-order corneal aberration changes after the SMILE.Results Three months after SMILE,the bIOP,ARTh,SP-A1 and SSI decreased significantly,while the DA2 ratio,IR and CBI increased significantly(all P＜0.05).Three months after SMILE,CV3 mm,CV5 mm,CV7 mm and CV10 mm decreased significantly(all P＜0.05).The corneal volume changes from small to large were CV3 mm,CV5 mm,CV7 mm and CV10 mm,with a maximum decrease in the outmost periphery.The RMS(Cornea,CF,CB)and RMS HOA(Cornea,CF,CB)increased significantly(all P＜0.05);compared with the changes in high-order aberration on the anterior corneal surface,the changes in higher-order aberration on the posterior corneal surface were relatively stable.Correlation analysis shows that △ARTh was positively correlated with △CV3mm and△CV5mm,and negatively correlated with △CV10mm(all P＜0.05);△bIOP was negatively correlated with △CV3mm,△CV5mm,△RMS HOA(CF)and △RMS HOA(Cornea)and positively correlated with △CV10mm(all P＜0.05);△IR was negatively correlated with △CV10 mm(P＜0.05);△SP-A1 was positively correlated with △CV10 mm(P＜0.05);△ CBI was negatively correlated with △CV3 mm and △CV5 mm,and positively correlated with △CV10mmand △RMS(CF)(all P＜0.05).Conclusion The changes in corneal biomechanical parameters occur in the early stage after SMILE,with a certain corre-lation with the corneal volume changes in different regions and high-order corneal aberration changes.

Correlation analysis of myopia aberration and objective depth of focus in the human eye / 中华实验眼科杂志

Objective:To investigate the correlation between low-order and high-order aberrations and objective depth of focus in the human eye, and the factors that influence objective depth of focus.Methods:A cross-sectional study was performed.Seventy-six patients (152 eyes) with myopia and astigmatism patients who were treated at the Refractive Surgery Center of Tianjin Eye Hospital from February to April 2022 were selected, including 41 males and 35 females.The patients' whole-eye low-order and high-order aberrations and objective depth of focus were measured at 3, 4, 5, and 6 mm manually selected pupil diameters using the iTrace visual function analyzer.The correlation between objective depth of focus and low-order and high-order aberrations at different pupil diameters was analyzed by Spearman rank correlation analysis.Objective depth of focus was compared between individuals with different degrees of myopia and astigmatism, individuals with different pupil diameters, right and left eyes, and different sexes.This study adhered to the Declaration of Helsinki.The study protocol was approved by the Ethics Committee of Tianjin Eye Hospital (No.2022039).Results:Objective depth of focus was positively correlated with total low-order aberrations at 3, 4, 5, and 6 mm pupil diameter ( rs=0.380, 0.317, 0.385, 0.519, all at P<0.01). Objective depth of focus was positively correlated with defocus at 3, 4, 5, and 6 mm pupil diameter ( rs=0.377, 0.323, 0.403, 0.512, all at P<0.01), and with astigmatism at 6 mm pupil diameter ( rs=0.255, P<0.05). There were statistically significant overall differences in objective depth of focus between groups with different degrees of myopia at 3, 4, 5, and 6 mm pupil diameter ( H=6.440, 7.370, 9.990, 16.930; all at P<0.05). Among them, the objective depth of focus of high myopia was significantly higher than that of low myopia at different pupil diameters, and the objective depth of focus of high myopia was higher than that of moderate myopia at 6 mm pupil diameter, with statistically significant differences (all at P<0.05). Objective depth of focus was positively correlated with total high-order aberration at pupil diameters of 3, 4, 5, and 6 mm ( rs=0.911, 0.807, 0.733, 0.677; all at P<0.001). Among various high-order aberrations, objective depth of focus was positively correlated with total coma at 3, 4, 5, and 6 mm pupil diameter ( rs=0.727, 0.557, 0.620, 0.487; all at P<0.001), positively correlated with vertical coma at 3, 4, 5, and 6 mm pupil diameter ( rs=0.439, 0.405, 0.553, 0.400; all at P<0.001), positively correlated with horizontal coma at 5 and 6 mm pupil diameter ( rs=0.308, 0.308; both at P<0.01), positively correlated with trefoil aberration at 3, 4, 5, and 6 mm pupil diameter ( rs=0.344, 0.443, 0.316, 0.330; all at P<0.01), positively correlated with spherical aberration at 4, 5, and 6 mm pupil diameter ( rs=0.321, 0.310, 0.428; all at P<0.01). There was a significant difference in objective depth of focus between 3 and 4 mm, 5 and 6 mm pupil diameters ( P=0.011, 0.004). There was no statistically significant difference in objective depth of focus between different degrees of astigmatism, between males and females, or between left and right eyes (all at P>0.05). Conclusions:The objective depth of focus of the human eye is mainly strongly correlated with vertical coma, trefoil aberration in high-order aberrations, as well as defocus in low-order aberrations.Horizontal coma and spherical aberration are strongly correlated with objective depth of focus only when the pupil diameter is large.In addition, if the pupil diameter is too small (3 mm) or too large (6 mm), it has a significant effect on the objective depth of focus.

Small incision lenticule extraction for the treatment of myopic anisometropia / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To explore the clinical effect of small incision lenticule extraction(SMILE)on the treatment of myopic anisometropia.METHODS: Clinical data of 76 patients(146 eyes)with myopic anisometropia who received SMILE or femtosecond assisted laser in situ keratomileusis(FS-LASIK)in our hospital from January 2021 to December 2022 were retrospectively analyzed. The patients were divided into SMILE group(39 cases, 77 eyes)and FS-LASIK group(37 cases, 69 eyes)according to surgical methods. Uncorrected visual acuity(UCVA), diopter, anisometropia, corneal aberration and occurrence of postoperative complications were compared between the two groups at 1 wk, 1 and 3 mo after surgery.RESULTS: The UCVA of the two groups was improved after surgery compared with that before surgery, and the coma, trefoil, spherical aberration and total higher-order aberration were significantly increased compared to those before surgery(P&#x003C;0.05), and the coma, trefoil, spherical aberration and total higher-order aberration in the FS-LASIK group were significantly higher than those in the SMILE group(P&#x003C;0.05). After follow-up to 3 mo after surgery, the incidence of postoperative complications was significantly lower in the SMILE group than that in the FS-LASIK group(5.2% vs 15.9%, P&#x003C;0.05).CONCLUSION: Both SMILE and FS-LASIK can effectively enhance the UCVA and improve the visual quality in patients with myopic anisometropia, but SMILE has lower corneal higher order aberrations, lower incidence of postoperative complications and better overall effect.

Transformation of dominant eye after small incision lenticule extraction and its effect on visual quality / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To analyze the changes of the dominant eye in myopic patients after small incision lenticule extraction(SMILE)and its effect on visual quality.METHODS: Prospective clinical study. A total of 140 patients(280 eyes)who underwent SMILE operation to correct myopia in the First Affiliated Hospital of Xinjiang Medical University from June to December 2022 were selected. They were divided into dominant eye transformation group(46 cases, 92 eyes)and non-transformation group(94 cases, 188 eyes)according to whether the dominant eye transformation occurred during the follow-up in postoperative 3 mo. The uncorrected visual acuity(UCVA)of the two groups was evaluated, the subjective visual quality was evaluated by the quality of life impact of refractive correction(QIRC)scale, and the objective visual quality was evaluated by measuring the high-order aberrations of the whole eye before and at 1 and 3 mo after surgery.RESULTS: Before SMILE, the right type of dominant eye was 105 cases, left-type was 35 cases. There were 46 cases had change at 1 mo postoperatively, and there was no new change at 3 mo after operation than 1 mo after operation. There was no significant difference in UCVA and QIRC scale score between the two groups preoperatively and at 1 and 3 mo postoperatively(P&#x003E;0.05). Comparison of the dominant eye between the two groups: the total higher-order aberrations and spherical aberrations at 3 mo postoperatively were significantly higher than those in the non-transformed group(P=0.030, 0.046); Comparison of the non-dominant eye between the two groups: trefoil in the transformed group at 1 mo postoperatively was significantly higher than that in the non-transformed group(P=0.008). The binocular difference of trefoil in the transition group was significantly higher than that in the non-transition group at 1 mo after surgery(P=0.022), with no differences in the rest parameters.CONCLUSION: Some patients may experience a change in the dominant eye after SMILE surgery, with no significant impact on subjective visual quality. The decrease of objective visual quality in the early postoperative period may be an associated factor in the dominant eye transformation.

Comparison of effective optical zone and corneal high order aberration following small incision lenticule extraction for different degrees of myopia / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To compare the effective optical zone(EOZ)and corneal high order aberrations(HOAs)after small incision lenticule extraction(SMILE)among low, moderate, and high myopic patients.METHODS:A total of 134 patients who had undergone SMILE at the Second People's Hospital of Foshan from February 2019 to February 2021 were recruited, with all right eyes enrolled. The patients were divided into low myopia group(SE &#x003E;-3.00 D), moderate myopia group(-6.00 D&#x003C; SE ≤-3.00 D), and high myopia group(SE ≤-6.00 D)according to the spherical equivalent(SE). The total HOA(tHOA), spherical aberration, coma, and EOZ were measured by Pentacam preoperatively and 1 mo postoperatively, and differences in tHOA, spherical aberration, coma, and EOZ among the three groups were analyzed.RESULTS: EOZ was smaller than programmed EOZ in all groups at 1 mo after SMILE. With the increase in corrected refractive error, the EOZ decreased further(P&#x003C;0.05); The tHOA, spherical aberration, and coma were significantly higher than their corresponding preoperative values in all groups at 1 mo after surgery, and there were statistical differences in the spherical aberration of all the groups at 1 mo after surgery(P&#x003C;0.05), except for that of the mild myopia group(P&#x003E;0.05). The tHOA, spherical aberration and coma increased with corrected refractive errors; the difference in tHOA and spherical aberration was statistically significant among the three groups(all P&#x003C;0.05). Coma in the high myopia group was significantly greater than that in the moderate myopia group and the mild myopia group(P&#x003C;0.05). In addition, the coma in the moderate myopia group and the mild myopia group was not statistically significant(P&#x003E;0.05).CONCLUSION: With the increase of the refractive power corrected by surgery, the postoperative EOZ reduced more after surgery, and the HOA of the cornea is increased; corneal HOA increases at 1 mo after SMILE.

Repeatability of wavefront aberration measured by adaptive optics visual simulator and agreement of OPD-Scan Ⅲ / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To assess the repeatability and agreement of higher-order aberration obtained by adaptive optics visual simulator(VAO)compared with OPD-Scan Ⅲ.METHODS: A cross-sectional study was conducted from August to September 2023, including a total of 204 patients(204 eyes)with myopia whose right eyes were measured. The examinations were performed by the same skilled examiner using both devices separately. The VAO device was used to measure higher order aberrations of orders 3 to 6 at a pupil diameter of 4.5 mm, while both the VAO and OPD-Scan Ⅲ devices were utilized to measure total higher-order aberration(tHOA), spherical aberration(SA), coma aberration(Coma), and trefoil aberration(Trefoil)of the entire eye at pupil diameters ranging from 3 to 6 mm. Furthermore, the repeatability of whole eye aberration measurements obtained with the VAO device was evaluated and the agreement of the two devices was assessed.RESULTS: The whole-eye higher-order aberrations measured by VAO demonstrated excellent repeatability(0.767≤ICC≤0.941, Sw&#x003C;0.01 μm, TRT&#x003C;0.1 μm). There was no statistically significant difference in Coma measured by VAO or OPD-Scan Ⅲ for pupil diameters ranging from 4 to 6 mm(P&#x003E;0.05), while a statistically significant difference was observed in whole-eye tHOA of other pupil diameters(all P&#x003C;0.05). The agreement of aberration measurements for each order between VAO and OPD-Scan Ⅲ for 3 mm pupil diameters, SA at 4 and 5 mm pupil diameter and Coma at 4 mm pupil diameter showed a 95% limit of agreement(LoA)&#x003C;0.1, indicating good agreement; however, poor agreement was found for the remaining aberration measurements at different pupil diameters, with a 95%LoA&#x003E;0.1, and there were significant differences in higher-order aberrations measured by two devices under a pupil diameter of 3 mm(r=0.218-0.317, P&#x003C;0.01), 4 mm(r=0.406-0.672, P&#x003C;0.01), 5 mm(r=0.538-0.839, P&#x003C;0.01 and r=0.030-0.109, P&#x003E;0.01)and 6 mm(r=0.369-0.766, P&#x003C;0.01).CONCLUSION: The VAO demonstrates favorable repeatability when assessing whole-eye higher order aberration under pupil diameters of 3-6 mm. However, there is inadequate agreement and interchangeability in whole-eye higher order aberration at 3-6 mm pupil diameter between VAO and OPD-Scan Ⅲ for clinical purposes.

Role of spherical aberration and coma in orthokeratology for myopia control / 国际眼科杂志(Guoji Yanke Zazhi)

As a highly prevalent global condition, myopia significantly impacts the ocular health of young individuals in China. Orthokeratology lens, as a rigid corneal contact lens, has demonstrated effective control over the progression of myopia; however, its mechanism of action remains incompletely elucidated. As one of the factors influencing visual acuity, higher-order aberrations will undergo marked changes after orthokeratology, with particular emphasis on the alterations in spherical aberrations and coma. The changes in corneal morphology induced by orthokeratology lead to significant positive increase in both spherical aberration and coma. Furthermore, the elevation of spherical aberration and coma demonstrates a negative correlation with the rate of axial length growth following orthokeratology. The interplay among spherical aberration, coma, defocus, accommodation, astigmatism, and pseudo-accommodation may constitute the underlying mechanism governing the control of myopia through orthokeratology.

Higher-order aberrations and visual quality after incision lenticule extraction surgery with intraoperative angle kappa adjustments between small and large kappa patients: A 2-year follow-up

Purpose: To evaluate the postoperative visual outcomes, that is, corneal higher?order aberrations (HOAs) and visual quality, of patients with an angle kappa greater than 0.30 mm who underwent angle kappa adjustment during small?incision lenticule extraction (SMILE) 2 years after surgery compared to eyes with an angle kappa less than 0.30 mm. Methods: This was a retrospective study and included 12 patients from October 2019 to December 2019 who underwent the SMILE procedure for correction of myopia and myopic astigmatism and had one eye with a large kappa angle and another eye with a small kappa angle. Twenty?four months after surgery, an optical quality analysis system (OQAS II; Visiometrics, Terrassa, Spain) was used to measure the modulation transfer function cutoff frequency (MTFcutoff), Strehl2D ratio, and objective scatter index (OSI). HOAs were measured with a Tracey iTrace Visual Function Analyzer (Tracey version 6.1.0; Tracey Technologies, Houston, TX, USA). Assessment of subjective visual quality was achieved using the quality of vision (QOV) questionnaire. Results: At 24 months postoperatively, the mean spherical equivalent (SE) refraction was ? 0.32 ± 0.40 and ? 0.31 ± 0.35 in the S?kappa group (kappa <0.3 mm) and the L?kappa group (kappa ?0.3 mm), respectively (P > 0.05). The mean OSI was 0.73 ± 0.32 and 0.81 ± 0.47, respectively (P > 0.05). There was no significant difference in MTFcutoff and Strehl2D ratio between the two groups (P > 0.05). Total HOA, coma, spherical, trefoil, and secondary astigmatism were not significantly different (P > 0.05) between the two groups. Conclusion: Adjustment of angle kappa during SMILE helps reduce the decentration, results in less HOAs, and promotes visual quality. It provides a reliable method to optimize the treatment concentration in SMILE.

Un caso de leucismo en el Juil de Jamapa, Rhamdia laticauda (Siluriformes, Heptapteridae) en el noreste del estado de Oaxaca, México

Se reporta la primera observación de un espécimen leucístico en el Juil de Jamapa, Rhamdia laticauda en el noreste del estado de Oaxaca. En un estudio ictiológico de la Reserva de la Biosfera Tehuacán-Cuicatlán en el río Xiquila de la cuenca alta del río Papaloapan, el pez se capturó con pesca eléctrica y se fotografió. El bagre vivo mostró una reducción de pigmentos en la piel, manchas blancas y ojos negros normales. Esto contribuye al conocimiento de la variabilidad intraespecífica y la historia natural de R. laticauda. Se discuten las causas potenciales de esta anomalía de color.

Here, we report the first observation of a leucistic specimen in the Rock catfish, Rhamdia laticauda in the Northeast of Oaxaca, Mexico. We caught the specimen by electric fishing and then photographed during an ichthyological survey carried out in the Tehuacán-Cuicatlán Biosphere Reserve in the Xiquila River of the upper Papaloapan River basin. The live catfish showed a lack of pigment in the skin, white spots, and normal eye color. This information contributes to the knowledge about intraspecific variability and natural history of R. laticauda. We discuss the potential causes of this color anomaly.

Reporte de Pecari tajacu y Procyon lotor con anomalías cromáticas en el Estado de Guerrero, México

Este trabajo documenta el primer registro de anomalías cromáticas en el pecarí de collar (Pecari tajacu) y el tercero en el mapache (Procyon lotor) para México. Los hallazgos se realizaron durante el monitoreo realizado entre el 2009 y el 2021, utilizando cámaras-trampa, principalmente en la ecorregión de la Sierra Madre del Sur del estado de Guerrero, México. Procyon lotor fue registrado entre el 5 de noviembre y el 1 de diciembre de 2019, en vegetación riparia de bosque tropical caducifolio (17°47'35"N, 98°39'59"W, 1134 m de altitud). Mientras que Pecari tajacu se registró el 7 de junio y el 22 de julio del 2021 en una brecha saca cosecha abandonada (17°38'12"N, 100°40'50"W; 1532 m de altitud).

This paper documents the first record of chromatic anomalies in Collared Peccary (Pecari tajacu) and the third in the Raccoon (Procyon lotor) for Mexico. The findings were made during monitoring conducted between 2009 and 2021, using camera traps, primarily in the Sierra Madre del Sur ecoregion of the state of Guerrero, Mexico. Procyon lotor was recorded between November 5th and December 1st, 2019, in riparian vegetation of a deciduous tropical forest (17°47'35"N, 98°39'59"W, 1134 m altitude). Meanwhile, Pecari tajacu was recorded on June 7th and July 22nd, 2021, in an abandoned crop clearing (17°38'12"N, 100°40'50"W; 1532 m altitude).

Impact of crossplay between ocular aberrations and depth of focus in topo-guided laser-assisted in situ keratomileusis outcomes

Purpose: To develop a nomogram in cases with mismatch between subjective and Topolyzer cylinder, and based on the magnitude of the mismatch, customize a treatment plan to attain good visual outcomes post?laser?assisted in situ keratomileusis (LASIK) surgery. Methods: The patients were evaluated preoperatively using corneal tomography with Pentacam. Five optimal corneal topography scans were obtained from the Topolyzer Vario were used for planning the LASIK treatment. For the nomogram purpose, the patients were divided into three categories based on the difference between the subjective cylinder and Topolyzer (corneal) cylinder. The first group (group 1) consisted of eyes of patients, where the difference was less than or equal to 0.4 D. The second group (group 2) consisted of eyes, where the difference was more than 0.4 D and the subjective cylinder was lesser than the Topolyzer cylinder. The third group (group 3) included eyes where the difference was more than 0.4 D but the subjective cylinder was greater than the Topolyzer cylinder. LASIK was performed with the WaveLight FS 200 femtosecond laser and WaveLight EX500 excimer laser. Assessment of astigmatism correction for the three groups was done using Aplins vector analysis. For comparison of proportions, Chi?square test was used. A P value less than 0.05 was considered statistically significant. Results: The UDVA was statistically significantly different when compared between groups 1 and 2 (P = 0.02). However, the corrected distance visual acuity (CDVA) was similar among all the three groups (P = 0.1). Group 3 showed an increase of residual cylinder by ?0.25 D, which was significant at intermediate and near reading distances (P < 0.05). Group 3 showed significantly higher target?induced astigmatism (TIA) compared to groups 1 and 2 (P = 0.01). The mean surgically induced astigmatism (SIA) was the least in group 2, which was statistically significant (P < 0.01). Conclusion: The outcomes for distance vision using our nomogram postoperatively were excellent, but further refinement for improving the near vision outcomes is required

Aumento das aberrações de alta ordem pós-ceratectomia fotorrefrativa guiada por frente de onda: relato de caso / Increased high-order aberrations after wavefront-guided photorefractive keratectomy: case report

RESUMO Ao remodelar a córnea usando um perfil de ablação individualizado para cada olho obtido por meio de aberrometria de frente de onda, o tratamento guiado por frente de onda tenta reduzir aberrações preexistentes e induzidas cirurgicamente, minimizando as aberrações de alta ordem (HOAs) visualmente significativas. No entanto, o aumento de HOA ainda é uma preocupação, mesmo com ablações personalizadas. Na cirurgia refrativa a laser miópica, como o feixe de laser entra na periferia, algumas partes são refletidas, e o feixe circular se torna elíptico, resultando em diminuição na eficácia da energia do laser. A subablação da córnea periférica pode ser induzida por esses fatores que aumentam a HOA, especialmente a aberração esférica. Este relato tem por finalidade mostrar uma paciente alto míope submetida à PRK guiada por frente de onda que evoluiu com aumento das HOAs.

ABSTRACT By reshaping the cornea using an individualized ablation profile for each eye obtained through wavefront aberrometry, wavefront guided treatment attempts to reduce preexisting and surgically induced aberrations while minimizing visually significant higher-order aberrations (HOAs). However, HOA enhancement is still a concern, even with custom ablations. In the myopic laser refractive surgery, as the laser beam enters the periphery, some parts are reflected, and the circular beam becomes elliptical, resulting in a decrease in the effectiveness of the laser energy. Peripheral corneal subablation can be induced by these factors that increase HOA, especially spherical aberration. This report aims to show a high myopic patient undergoing wavefront-guided PRK, who evolved with an increase in HOAs.

Visual quality observation of transepithelial photorefractive keratectomy and femtosecond small incision lenticule extraction for the correction of low myopia / 国际眼科杂志(Guoji Yanke Zazhi)

AIM:To observe the changes in corneal aberrations and the characteristics of visual quality after transepithelial photorefractive keratectomy(T-PRK)and femtosecond small incision lenticule extraction(SMILE)in the correction of low myopia.METHODS: Prospective cohort study. A total of 32 cases(32 eyes)with low myopia who underwent T-PRK surgery and 45 cases(45 eyes)of SMILE surgery at Weifang Eye Hospital from April 2021 to April 2022 were selected. The uncorrected visual acuity(UCVA), best corrected visual acuity(BCVA), spherical equivalent(SE), corneal higher-order aberrations(HOAs)and objective visual quality were compared between the two groups.RESULTS:All patients completed the surgery successfully without complications such as infection. At 3mo postoperatively, the safety index was 1.13±0.16 and 1.16±0.17(P=0.48)and the efficacy index was 1.10±0.20 and 1.15±0.18(P=0.27)in the T-PRK and SMILE groups, respectively. The percentage of UCVA(LogMAR)≤0 in the T-PRK and SMILE groups was 94% and 98%, respectively. The percentage of the residual SE within ±0.5D was 88% and 87% in the two groups, respectively. The HOAs and spherical aberration in both groups were significantly increased(P≤0.01), and the increase was not statistically significant between the two groups(P=0.31, 0.89). There was no significant change in horizontal coma, horizontal trefoil and vertical trefoil in both groups(P&#x0026;#x003E;0.05). The vertical coma in SMILE group was significantly increased(P&#x0026;#x003C;0.001), while there was no significant change in T-PRK group(P&#x0026;#x003E;0.05), and the increase was significantly greater in SMILE group than in T-PRK group(P&#x0026;#x003C;0.001). There was no significant difference in objective scattering index(OSI), modulation transfer function cut off frequency(MTFcut off), Strehl ratio(SR), visual acuity(VA)100%, VA20% and VA9% between the two groups(P&#x0026;#x003E;0.05).CONCLUSION:Both T-PRK and SMILE showed good safety, efficacy, and visual quality in correcting low myopia, while SMILE induced more vertical coma than T-PRK.

Changes in retinal peripheral refractive status and aberrations before and after femtosecond laser-assisted laser in situ keratomileusis and small incision lenticule extraction / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To observe and compare the changes in retinal peripheral refraction and aberrations after femtosecond laser-assisted laser in situ keratomileusis(FS-LASIK)versus small incision lenticule extraction(SMILE)for myopia correction.METHODS: A total of 71 patients(71 eyes)with myopia who underwent FS-LASIK from October 2022 to April 2023 in our hospital were selected as the FS-LASIK group, and 80 patients(80 eyes)with myopia who underwent SMILE were selected as the SMILE group. All patients underwent corneal wavefront aberration measurement and multispectral refractive topography preoperatively and 3mo postoperatively, as well as refraction difference value(RDV)in the range of 0°～10°, 10°～20°, 20°～30°, 30°～40°, and 40°～53° in the annulus of the retina, which were recorded as RDV-(0°～10°), RDV-(10°～20°), RDV-(20°～30°), RDV-(30°～40°), and RDV-(40°～53°). The results of two groups of patients were compared.RESULTS: No significant differences were observed in RDV-(0°～10°), RDV-(10°～20°), RDV-(20°～30°), RDV-(30°～40°), RDV-(40°～53°)between the two groups at 3mo post-operation(all P&#x003E;0.05). Furthermore, the RDV-(20°～30°), RDV-(30°～40°)and RDV-(40°～53°)of the two groups at 3mo postoperatively were all significantly lower than those preoperatively(all P&#x003C;0.05). The changes in coma(horizontal)and spherical aberration(SA)at 3mo postoperatively were smaller in the SMILE group [0.106(0.056, 0.171)and 0.115(0.081, 0.182)μm] than in the FS-LASIK group [0.206(0.104, 0.355)and 0.197(0.128, 0.254)μm](Z=-4.170, -5.016, all P&#x003C;0.05). A negative correlation was found between postoperative SA and postoperative RDV-(10°～53°)(rs=-0.205, -0.181, -0.226, -0.244, all P&#x003C;0.05).CONCLUSION: Both FS-LASIK and SMILE reduced retinal hyperopic defocus in the peripapillary macular range of 20°～53° eccentricity, and the postoperative changes in coma(horizontal)and SA were smaller with SMILE than with FS-LASIK. There was a certain correlation between postoperative SA and postoperative retinal peripheral defocus.

Comparison of corneal higher order aberration after femtosecond laser-assisted laser in situ keratomileusis and small incision lenticule extraction / 中华实验眼科杂志

Objective:To analyze and compare the corneal higher order aberration (HOA) after femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) and small incision lenticule extraction (SMILE).Methods:A non-randomized controlled study was conducted.Sixty myopic patients (60 eyes) who underwent FS-LASIK or SMILE correction at Shandong Eye Hospital from April 2018 to January 2020 were enrolled and the data from the right eye were collected for analysis.Thirty cases (30 eyes) who received FS-LASIK in FS-LASIK group and 30 cases (30 eyes) who received SMILE in SMILE group had a preoperative equivalent spherical diopter of (-5.36±1.11)D and (-4.93±1.03)D, respectively.The HOA of the 6-mm anterior surface, posterior surface, and whole cornea were measured before surgery and at 1, 3, 6, and 12 months after surgery using Pentacam.The root mean square values (μm) of total corneal HOA, spherical aberration, coma and trefoil were obtained.Differences in the above root mean square values at different time points were compared between the two groups.The study protocol adhered to the Declaration of Helsinki and was approved by the Ethics Committee of Shandong Eye Hospital (No.SDSYKYY20180306). Written informed consent was obtained from each subject.Results:The preoperative and 1-, 3-, 6-, 12-month postoperative total HOA of the anterior corneal surface were (0.428±0.126), (0.775±0.169), (0.811±0.194), (0.759±0.214), (0.704±0.199)μm in the FS-LASIK group and (0.409±0.094), (0.656±0.148), (0.681±0.161), (0.668±0.175), (0.648±0.160)μm in the SMILE group, with a significant overall difference ( Fgroup=5.652, P=0.024; Ftime=107.169, P<0.01). Compared with SMILE group, the postoperative total HOA of anterior corneal surface and spherical aberration at different time points were increased in FS-LASIK group, showing statistically significant differences (all at P<0.05). Compared with before surgery, the postoperative total HOA of the anterior corneal surface and spherical aberration at different time points were increased in both groups, showing statistically significant differences (all at P<0.05). In the two groups, the 6- and 12-month postoperative total HOA of the anterior corneal surface were reduced in comparison with the 3-month postoperative ones of the anterior corneal surface, and the 12-month postoperative spherical aberrations of the anterior corneal surface were significantly reduced in comparison with the 1- and 3-month postoperative ones of the anterior corneal surface, showing statistically significant differences (all at P<0.05). There were significant differences in the coma and trefoil of the anterior corneal surface between before and after the operation (coma: Ftime=47.848, P<0.01; trefoil: Ftime=2.497, P=0.046). Compared with before surgery, the postoperative coma was significantly increased in the two groups (all at P<0.05). There were significant differences in total corneal HOA and spherical aberration at different postoperative time points between the two groups (total HOA: Fgroup=8.093, P=0.008; Ftime=125.019, P<0.01.spherical aberration: Fgroup=4.771, P=0.037; Ftime=34.033, P<0.01). Compared with SMILE group, the total corneal HOA and spherical aberration were significantly increased in FS-LASIK group at different postoperative time points (all at P<0.05). Compared with before surgery, postoperative total HOA of the anterior corneal surface and spherical aberration at different postoperative time points were significantly increased in both groups (all at P<0.05). In both groups, the 12-month postoperative corneal spherical aberration was significantly reduced in comparison with the 1- and 3-month postoperative ones (all at P<0.05). There was a significant difference in coma between before and after surgery ( Ftime=30.829, P<0.01). Compared with before surgery, the postoperative coma was significantly increased at different time points in both groups (all at P<0.05). Conclusions:Both FS-LASIK and SMILE increase the HOA of the anterior corneal surface and the whole cornea.Compared with FS-LASIK, SMILE introduces less HOA of the anterior corneal surface and the whole cornea as well as spherical aberrations.

Comparison of early postoperative visual quality between SMILE and SPT-TransPRK / 中华实验眼科杂志

Objective:To investigate the differences and changes in early postoperative visual quality after small incision lenticule extraction (SMILE) and smart pulse technology-assisted transepithelial photorefractive keratectomy (SPT-TransPRK).Methods:A cohort study was performed.A total of 92 patients (92 eyes) who underwent corneal laser refractive surgery were enrolled in Dalian Third People's Hospital Affiliated to Dalian Medical University from February 2021 to May 2021.The data from the right eye were collected for analysis.The patients were divided into SMILE group (40 patients, 40 eyes) and SPT-TransPRK group (52 patients, 52 eyes). Preoperative, 1- and 3-month postoperative visual acuity were measured to calculate the effectiveness, which was defined as the ratio of postoperative uncorrected visual acuity (UCVA) to preoperative best corrected visual acuity.Refraction was measured by an AR-1 autorefractor.Corneal higher-order aberration (HOA) including total HOA, spherical aberration and coma was measured by Sirius corneal topographer.Objective scatter index (OSI), modulation transfer function cut-off frequency (MTF cut-off), Strehl ratio (SR), simulated contrast visual acuity VA100 (day), VA20 (dusk) and VA9 (night) were measured via OQAS II visual quality analysis system.This study adhered to the Declaration of Helsinki.The study protocol was approved by the Ethics Committee of the Dalian Third People's Hospital Affiliated to Dalian Medical University (No.2019-KT-010). Written informed consent was obtained from each subject.Results:There was no significant difference in 3-month postoperative UCVA and effectiveness between the two groups ( Z=0.880, P=0.380; t=0.920, P=0.058). Patients in SPT-TransPRK group showed mild hyperopia 3 months after surgery.Preoperative, 1- and 3-month postoperative total corneal HOA was (0.47±0.18), (0.70±0.22) and (0.74±0.19)μm in SMILE group, and (0.40±0.14), (0.98±0.35) and (0.94±0.22)μm in SPT-TransPRK group respectively, showing statistically significant differences ( Fgroup=13.851, P=0.001; Ftime=29.960, P<0.001). Preoperative, 1- and 3-month postoperative spherical aberration was (-0.20±0.09), (-0.44±0.14) and (-0.44±0.15)μm in SMILE group, and (-0.20±0.10), (-0.71±0.23) and (-0.75±0.20)μm in SPT-TransPRK group respectively, showing statistically significant differences ( Fgroup=31.037, P<0.001; Ftime=48.005, P<0.001). The postoperative total corneal HOA and spherical aberration were increased in both groups compared with before surgery, with statistically significant differences (all at P<0.05). The 1- and 3-month postoperative total corneal HOA and spherical aberrations were smaller in SMILE group than in SPT-TransPRK group, and the differences were statistically significant (all at P<0.05). The 1- and 3-month postoperative coma were increased in both groups compared with before surgery, showing statistically significant differences (all at P<0.05). In SMILE group, 1-month postoperative OSI was higher and 1-month postoperative MTF cut-off, SR, and VA9 were lower than those before surgery, and 3-month postoperative OSI was higher and 3-month postoperative SR and VA9 were lower than those before surgery, showing statistically significant differences (all at P<0.05). In SPT-TransPRK group, 1-month postoperative OSI was higher and 1-month postoperative MTF cut-off, SR, VA100, VA20, and VA9 were lower than those before surgery, showing statistically significant differences (all at P<0.05). There was no significant difference in OSI, MTF cut-off, SR, VA100, VA20, and VA9 between 3 months postoperatively and before surgery in the SPT-TransPRK group (all at P>0.05). There was no significant difference in coma, OSI, MTF cut-off, SR, VA100, VA20, and VA9 between two groups (all at P>0.05). Conclusions:Both SMILE and SPT-TransPRK are effective methods for correcting myopia and they have comparable visual quality.Compared with SPT-TransPRK, corneal total HOA and spherical aberration are smaller after SMILE.

Comparison of corneal epithelial remodeling and corneal aberration changes after FS-LASIK and FS-LASIK Xtra / 中华实验眼科杂志

Objective:To investigate the status of corneal epithelial remodeling and changes in corneal aberration after femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) and FS-LASIK combined with corneal collagen cross-linking (FS-LASIK Xtra), and to analyze the relationship between corneal epithelial thickness (CET) and corneal aberration.Methods:A cohort study was conducted.A total of 172 patients (172 eyes) who underwent FS-LASIK at Yinhai Eye Hospital of Chengdu University of Traditional Chinese Medicine were enrolled from June 2021 to February 2022.The 172 eyes were divided into FS-LASIK group (94 eyes) and FS-LASIK Xtra group (78 eyes) according to the surgical procedure, with a total follow-up of 6 months.The cornea was divided into a central 2-mm ring and a ring of 2-5 mm centered on the central cornea.CET at 9 regions in the central 0-5 mm area was measured by OCT before and at 1, 3 and 6 months after surgery, and the corneal higher-order aberration (HOA) was measured by the iTrace visual function analyzer.The main outcomes were the increase in CET (ΔCET), and corneal HOA at 6 months after surgery.The relationship between central corneal ΔCET and corneal aberration was analyzed.This study adhered to the Declaration of Helsinki.The study protocol was approved by the Ethics Committee of Yinhai Eye Hospital of Chengdu University of Traditional Chinese Medicine (No.2021yh-009). Written informed consent was obtained from each subject.Results:At 1, 3 and 6 months after surgery, the central, superior, superior nasal, nasal, inferior nasal, inferior, inferior temporal, temporal and superior temporal ΔCET were significantly smaller in FS-LASIK Xtra group than in FS-LASIK group (all at P<0.05). In FS-LASIK Xtra group, 6-month postoperative central, superior, superior nasal, inferior and inferior temporal ΔCET were significantly larger than those at 1 month after surgery, and 3- and 6-month postoperative temporal ΔCET were significantly larger than that at 1 month after surgery, and 6-month postoperative superior temporal ΔCET was significantly larger than those at 1 and 3 months after surgery (all at P<0.05). In FS-LASIK group, 3- and 6-month postoperative central, superior, inferior and inferior temporal ΔCET were significantly larger than those at 1 month after surgery, and 6-month postoperative superior nasal ΔCET was significantly larger than that at 3 months after surgery, and 6-month postoperative nasal, inferior nasal, temporal, superior temporal ΔCET were significantly larger than those at 1 and 3 months after surgery (all at P<0.05). There was no significant difference in vertical trefoil, vertical and horizontal coma changes at different time points after surgery between both groups (vertical trefoil: χ2group=4.27, P=0.118; χ2time=0.01, P>0.05.vertical coma: χ2group=5.74, P=0.057; χ2time=0.08, P=0.957.horizontal coma: χ2group=3.97, P=0.137; χ2time=0.51, P=0.773). The tilted trefoil changes at 1, 3 and 6 months after surgery of FS-LASIK Xtra group were significantly larger than those of FS-LASIK group (all at P<0.05). The 6-month spherical aberration change in FS-LASIK Xtra group was significantly higher than that at 1 month after surgery, and the 6-month spherical aberration change in FS-LASIK group was significantly higher than that at 1 and 3 months after surgery (all at P<0.05). The 6-month total HOA change in FS-LASIK group was significantly lower than that at 1 and 3 months after surgery (all at P<0.05). In FS-LASIK group, central corneal ΔCET was weakly positively correlated with spherical aberration at 1 and 6 months after surgery ( rs=0.257, P=0.008; rs=0.244, P=0.012), and was weakly positively correlated with total HOA ( rs=0.253, P=0.009; rs=0.279, P=0.004). Conclusions:The postoperative ΔCET after FS-LASIK Xtra is smaller than that after FS-LASIK, but the homogeneity of ΔCET in each region is similar between the two groups.The changes in corneal HOA after surgery are similar in both groups, and there is a certain association between the overall epithelial distribution and corneal aberration.

Effects of femtosecond laser assistcataract extraction on the levels of inflammatory factors in aqueous humor, corneal perception and high order aberration / 中国医师进修杂志

Objective:To investigate the effects of femtosecond laser assistcataract extraction on the levels of inflammatory factors in aqueous humor, corneal perception and high order aberration.Methods:Forty-eight patients (56 eyes) undergoing cataract surgery in the Shouguang People′s Hospital from June 2018 to February 2020 were enrolled in this study, and they were divided into observation group (24 patients and 27 eyes, femtosecond laser cataract phacoemulsification) and control group (24 patients and 29 eyes, coaxial microincision phacoemulsification) by random number table method. The levels of prostglndin E2 (PGE2), interleukin (IL)-6 and IL-1β in aqueous humor were detected before and after operation. Upper corneal and central corneal perception thresholds were recorded before surgery, 7 d after surgery, 1 month after surgery and 3 months after surgery. High order aberrations of the whole eye and cornea at 4mm pupil diameter before and after operation were recorded.Results:After operation, the levels of PGE2, IL-6 and IL-1β in aqueous humor in the observation group were lower than those in the control group: (45.62 ± 5.71) ng/L vs. (63.65 ± 5.62) ng/L, (15.25 ± 3.21) ng/L vs. (24.59 ± 6.13) ng/L, (17.16 ± 1.28) ng/L vs. (25.74 ± 4.62) ng/L, the differences were statistically significant ( P<0.05). The upper and central corneal perception threshold of observation group after operation for 7 d were higher than those in the control group: 4.55 ± 0.50 vs. 4.20 ± 0.33, 5.68 ± 0.49 vs. 5.52 ± 0.45, the differences were statistically significant ( P<0.05). The indexes of high order aberration of the whole eye decreased in the two groups ( P<0.05), while the indexes of cornea did not change significantly. The indexes of high order aberration of the whole eye and cornea between before and after surgery between the two groups had no significant differences ( P>0.05). Conclusions:Femtosecond laser assist cataractextraction can relieve inflammation, reduce the whole eye high order aberration, but not affect the cornea, and can improve corneal perception.