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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>0.05). The vertical coma in SMILE group was significantly increased(P<0.001), while there was no significant change in T-PRK group(P>0.05), and the increase was significantly greater in SMILE group than in T-PRK group(P<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>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.
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@#AIM: To evaluate the retinal image of two types of aspheric diffractive multifocal intraocular lens(IOL).<p>METHODS: Retrospective cohort study. Totally 155 cases of simple cataract who received phacoemulsification combined with IOLs implantation from October 2017 to October 2019. They were divided into three groups according to the types of IOL: Aspheric Bifocal Diffractive Group: 54 patients(54 eyes); Aspheric Trifocal Diffractive Group: 54 patients(54 eyes); Aspheric Monofocal Group: 47 patients(47 eyes). All patients were evaluated postoperatively at 6mo. Double-pass visual quality analysis system was used to evaluate OSI, MTF cutoff, Strehl Ratio, OV 100%, OV 20% and OV 9% respectively. Uncorrected distance visual acuity(5m), uncorrected intermediate visual acuity(80cm), uncorrected near visual acuity(40cm), corrected distance visual acuity, distance-corrected intermediate visual acuity, distance-corrected near visual acuity were measured and compared among three groups. Visual function-14 was also assessed.<p>RESULTS:Both of bifocal and trifocal groups had similar MTF cutoff(<i>P</i>=0.445), OV 100%, OV 20% and OV 9%(OV 100%: <i>P</i>=0.974; OV20%: <i>P</i>=0.713; OV 9%: <i>P</i>=0.947). Monofocal group had better MTF cutoff(<i>P</i>=0.007), OV 100%(<i>P</i>=0.001), OV 20%(<i>P</i>=0.002)and OV 9%(<i>P</i>=0.011)than bifocal. Besides, monofocal group had better MTF cutoff(<i>P</i>=0.043), OV 100%(<i>P</i>=0.012), OV 20%(<i>P</i>=0.043)and OV 9%(<i>P</i>=0.029)than trifocal group. There was no difference among all groups in uncorrected distance visual acuity and corrected distance visual acuity(<i>P</i>=0.054, 0.180). There was difference in distance-corrected intermediate(<i>H</i>=91.292, <i>P</i><0.01)and distance-corrected near visual acuity(<i>H</i>=91.292, <i>P</i><0.01). Uncorrected intermediate visual acuity was better in trifocal group than bifocal(<i>P</i><0.01)and monofocal group(<i>P</i><0.01). Distance-corrected intermediate visual acuity was better in trifocal group than bifocal(<i>P</i><0.01)and monofocal group(<i>P</i><0.01). Both of bifocal and trifocal groups have similar uncorrected near visual acuity(<i>P</i>=0.428)and distance-corrected near visual acuity(<i>P</i>=0.519), which was better than monofocal group(<i>P</i><0.01). In terms of VF-14, score in bifocal and trifocal groups are significantly higher than the monofocal group(<i>P</i><0.01). There was no difference in bifocal and trifocal groups(<i>P</i>=0.055).<p>CONCLUSION: Bfocal and trifocal diffractive IOL can provide similar retinal image. Trifocal IOL can provide better itermediate visual acuity.
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Purpose: To compare the outcomes of two techniques, for preparation of microkeratome-assisted ultrathin grafts for Descemet's stripping automated endothelial keratoplasty (DSAEK). Methods: The study involved 20 eyes of 20 patients with pseudophakic bullous keratopathy, randomized into two groups. Group 1 eyes underwent microkeratome-assisted DSAEK using the single-pass technique for lenticule preparation, whereas group 2 eyes underwent microkeratome-assisted DSAEK using the double-pass technique. Patients were followed up till 6 months, postoperatively. Best-corrected visual acuity (BCVA) at final follow-up was considered as the primary outcome measure, whereas graft thickness (GT) contrast sensitivity and endothelial cell loss were considered as the secondary outcome measures. A P value of <0.05 was considered as statistically significant. Results: Baseline characteristics of two groups were comparable. The mean central GT was comparable in both groups at 6 months follow-up [group 1: 98 ± 24.46 ?m, group 2: 129 ± 31.46 ?m (P = 0.18)]. Both groups fared equally in terms of BCVA (P = 0.33). Contrast sensitivity was significantly better in group 1 eyes (P = 0.045). A statistically significant negative correlation was found between postoperative BCVA and postoperative GT (R = ?0.728, P = 0.016). The percentage endothelial cell loss was slightly higher in group 2 eyes, although not statistically significant. Two eyes in group 2 experienced complications during lenticule preparation. None of the eye experienced any complication in the postoperative period. Conclusion: Both techniques provided grafts with comparable thickness and endothelial cell loss and were associated with comparable BCVA, at final follow-up visit. The contrast sensitivity was, however, better in eyes receiving grafts prepared with the single-pass technique.
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@#AIM: To evaluate the clinical efficacy of the posterior chamber intraocular lens(ICL)implantation for high myopia by the double-pass optical quality analysis system II(OQAS II).<p>METHODS: A total of 26 eyes of 52 patients with high myopia admitted to the First Affiliated Hospital of Anhui Medical University from December 2017 to December 2018 were selected. All patients underwent ICL implantation. Follow-up to obtain the best corrected visual acuity(BCVA)of all patients. And a series of parameters, such as uncorrected visual acuity(UCVA), object scatter index(OSI), modulation transfer function(MTF), Strehl ratio(SR)and Predicted VA of 100%,20% and 9%,were obtained before and 1wk,1 and 3mo after operation.<p>RESULTS: Compared with preoperative UCVA and BCVA, the 1wk, 1 and 3mo UCVA were better than preoperative and gradually improved, and the differences were statistically significant(<i>P</i><0.01). Compared with OSI, MTF, SR and Predicted VA 100%, 20% and 9% before operation, the situation improved at 1wk,1 and 3mo after operation, with statistical significance(<i>P</i><0.01).<p>CONCLUSION: ICL implantation can effectively correct high myopia and improve UCVA. Through OQAS II analysis, OSI was reduced after ICL implantation. The postoperative MTF, SR and Predicted VA of 100%, 20% and 9% higher than those before surgery. The visual quality of patients with high myopia was improved after ICL implantation.
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@#AIM: To evaluate the early postoperative efficacy of SMART for myopia and compare it with TransPRK.<p>METHODS: Retrospective non-randomized controlled study. Totally 120 eyes of 60 patients with myopia who underwent SMART and TransPRK in our hospital from January to August 2018 were selected respectively. The uncorrected visual acuity(UCVA), visual quality, pain score, corneal epithelial healing and subepithelial haze were compared between two groups.<p>RESULTS: There was no statistical differences between two groups regarding the proportion of UCVA reaching or exceeding 1.0 at 5d, 1mo and 3mo after operation(<i>P</i>>0.05), but the visual quality of SMART group was better than that of TransPRK group at 5d after operation(<i>P</i><0.05), and with the prolongation of time, the visual quality of the two groups gradually improved. There was a significant difference in pain scores between the TransPRK group and SMART group(3.56±0.96 <i>vs</i> 3.07±1.07; 1.22±0.61 <i>vs</i> 0.84±0.59)on the 1st day and 3rd day after operation(<i>P</i><0.01). 5d after operation, the complete recovery rate of corneal in TransPRK group was lower than that in SMART group(69.2% <i>vs</i> 83.3%, <i>P</i><0.05). At 1st and 3 mo after operation, there was no difference in haze between the two groups(5.0% <i>vs</i> 5.0% and 8.3% <i>vs</i> 10.0%; <i>P</i>>0.05).<p>CONCLUSION: There is no significant difference between SMART and TransPRK in the speed and stability of visual acuity recovery, but the early postoperative pain of SMART is lighter, the corneal epithelium is healed faster, and the visual quality is better.
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@#AIM: To evaluate the accuracy of qualitative prediction of cataract surgery by double-pass optical quality analysis system(OQASTMⅡ).<p>METHODS: A retrospective study was conducted. Totally 57 cataract patients(67 eyes)were randomly selected from October 2018 to December 2018 in Renmin Hospital of Wuhan University. According to the objective scattering index(OSI), they were divided into group A(28 eyes, OSI>8.0), group B(28 eyes, OSI≤8.0), and group C(11 eyes, OSI could not be detected due to severe lens opacity). The effect of surgery was predicted by Predicted VA100% and preoperative BCVA.<p>RESULTS: In group A, 26 eyes(93%)comply with the standard, and in group B, 24 eyes(86%)comply with the standard. There was no significant difference between the two groups(<i>P</i>=0.669). Besides, no correlation was found between Predicted VA100% and postoperative 2wk BCVA(<i>r</i><sub>s</sub>=0.103, <i>P</i>>0.5).<p>CONCLUSION: The OQASTMⅡ system can objectively, accurately and intuitively predict the effect of cataract surgery.
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@#AIM: To compare the visual quality between implantable collamer lens(ICL)implantation and FS-LASIK for correcting moderate and high myopia.<p>METHODS: Prospective study. Choose in June 2018 to December 2018 for ICL implantation of 58 patients(116 eyes)and 48 patients(96 eyes)underwent FS-LASIK. The diopter, visual acuity and visual quality of the two groups before and after surgery were analyzed and compared.<p>RESULTS: After 3mo operation, the degree of spherical mirror in the ICL group was higher than that in the FS-LASIK group(0.19±0.22D <i>vs</i> 0.09±0.29D, <i>P</i><0.05), but there was no difference in visual acuity, lenticule degree and spherical equivalent between the two groups(<i>P</i>>0.05). The modulation transfer function cut off frequency(MTF cut off), objective scatter index(OSI)and OV9% were significantly better in the ICL group than in the FS-LASIK group, while the SR was lower than the FS-LASIK group. Compared with the former, the MTF cut off was significantly increased in the ICL group, the SR and OSI values were decreased, and the SR value was decreased in the FS-LASIK group(all <i>P</i><0.05).<p>CONCLUSION: Both ICL implantation and FS-LASIK can effectively improve the visual acuity and diopter of patients, ICL implantation for patients with moderate and high myopia provides relatively good visual quality.<p>
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@#AIM: To evaluate the effects of femtosecond laser <i>in situ</i> keratomileusis(FS-LASIK)on visual quality of myopia with different refractive degrees using the Optical Quality Analysis System(OQAS).<p>METHODS: A total of 65 myopic patients(130 eyes)who received FS-LASIK were collected, which were divided into three groups of low, medium and high myopia. The changes of visual quality parameters before and after surgery were compared by OQAS system.<p>RESULTS:The values of OV100% and MTF cutoff in the low myopia group at 10d after surgery were higher than those in the high myopia group, and the values of OV20% and OV9% were higher than those in the medium and high myopia group(all <i>P</i><0.017). At 1d after surgery in low myopia group and at 1d, 10d and 30d after surgery in medium and high myopia group had significantly higher OSI and Mean OSI, while MTF cutoff, SR, OV100%, OV20% and OV9% were significantly lower than those before surgery(all <i>P</i><0.0083). Mean OSI was negatively correlated with OV100%, OV20%, OV9%, SR, MTF cutoff and positively correlated with OSI(all <i>P</i><0.05).<p>CONCLUSION:Optical quality decreases in the early period after FS-LASIK for correction of distinct refractive errors, and the visual quality recovery after the operation of low myopia is faster than that of medium and high myopia. The changes of tear film function and visual quality after FS-LASIK were consistent.
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@#AIM: To evaluate the effect of astigmatism on optical quality in young myopic patients by a double-pass system. <p>METHODS: Retrospective series of case studies, 258 young myopia patients(479 eyes)were selected and divided into four groups according to the degree of astigmatism: -1D< astigmatism ≤0 for Group L, -2D< astigmatism ≤-1D for Group M, -3D< stigmatism ≤-2D for Group H, -4D≤ astigmatism ≤-3D for Group S. Optical Quality Analysis System(OQASTM II)based on double-pass system was used to examine the patient's optical quality, the following parameters were analyzed: MTF cutoff, OSI, SR, OV100%, OV20%, and OV9%. <p>RESULTS: As the degree of astigmatism incresaes, MTF cutoff, SR, OV100%, OV20% and OV9% gradually decrease and OSI increases; Except for Group L and the Group M(<i>P</i>>0.05), the difference of MTF cutoff and OSI between the other groups were statistically significant(<i>P</i><0.05). In this study, there were no significant correlation between MTF cutoff and SR in age, and negative correlation with the degree of astigmatism. OSI had no significant correlation with age and was positively correlated with the degree of astigmatism. <p>CONCLUSION: The degree of astigmatism has a significant influence on the objective optical quality of low-to-moderate myopia in young people. As the degree of astigmatism increases, the optical quality gradually decreases.
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Objective: To analyze and explore the application of duable-pass optical quality analysis system(OQAS) on the evaluation of visual quality for patients with high myopia complicated with cataract who received intraocular lens implantation. Methods: The documents of 93 patients with high myopia complicated with cataract were collected in the retrospective analysis. And all of patients received ultrasonic emulsification and intraocular lens implantation. And then the visual situation and the changes of PSF, OSI, MTF, MTFcutoff, SR, OV100%, OV20%and OV9%were evaluated by using double-pass OQAS at three points included pre-operation, 1week of post-operation and 1month of post-operation. Results: After treatment, the visual situation of patients were significantly improved, and the differences of visual situations among pre-operation, 1 week of post-operation and 1 month of post operation were significant (F=6.831, P<0.05). And the differences of OSI, PSF and OV9%between the before and after treatment were significant (F=6.732, F=9.102, F=5.029, P<0.05), respectively. While the differences of MTFcutoff, SR, OV100%and OV20% between the two groups were no significant. Under the conditions of 5 cpd and 10 cpd of MTF, the differences of MTF among pre-operation, 1 week post operation and 1month post operation were significant (F=8.029, F=4.039, P<0.05), respectively. Besides, at 1 week post-operation and 1month post-operation, the differences among 5cpd, 10cpd and 15cpd were significant(F=7.829, F=6.921, P<0.05), respectively. Conclusion: After the patients with high myopia complicated with cataract receive intraocular lens implantation of ultrasonic emulsification, the visual analysis system of dual channel can preferably evaluate the visual quality of patients, and can objectively reflect aberration, scattering and diffraction, etc. Therefore, it is worthy to be popularized and applied.
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·AIM: To evaluate the effectiveness of visian implantable collamer lens with central hole (ICL V4c) implantation for the correction of high myopia using the double- pass visual quality analysis system. ·METHODS: Totally 60 eyes of 30 high myopia patients who underwent ICL V4c implantation were enrolled into this prospective randomized control study. Myopic degree of selected patients was -6. 0D to -12. 0D, age 18 to 35 years old, best corrected visual acuity ( BCVA ) ≥0. 6, preoperative corneal astigmatism acuities ≤1. 0D. All patients were taken the temporal side transparent corneal incision. The patients were evaluated postoperatively 1wk, 1 and 3mo respectively. The evaluating items included preoperative BCVA, postoperative uncorrected visual acuity ( UCVA), objective scattering index ( OSI), and modulation transfer function ( MTF ) cut off frequency, Strehl ratio (SR), and 100%, 20%, 9% Optical Quality Analysis System ( OQAS ) Value ( OV, contrast visual acuity ). All statistical analyses were performed with SPSS19. 0 statistical software. Variance analysis of repeated measurement data was employed. ·RESULTS: The UCVA gradually improved at 1wk, 1 and 3mo after surgery. There was statistical significance compared with the preoperative BCVA ( P < 0. 01 ). The postoperative OSI, MTF cut off, SR, OV 100%, OV 20% and OV 9% at 1wk, 1 and 3mo showed statistically differences compared with the preoperative values (P<0. 05). ·CONCLUSION: ICL V4c implantation can effectively correct high myopia range from -6. 0D to -12. 0D. The postoperative OSI were smaller than the preoperative OSI. The postoperative UCVA were better than the preoperative BCVA. The value of postoperative MTF cut off, SR, and OV value of 100% , 20% and 9% improved.
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Objective To evaluate the optical quality in patients with meibomian gland dysfunction (MGD) by using double-pass optical quality analysis system (OQAS-Ⅱ) for offering the reference data for clinical practices.Methods A total of 50 patients with a diagnosis of MGD,who were divided into MGD with dry eye disease (DED) group (n =22) and MGD without DED group (n =28) according to the results of tear film break-up time (BUT) and Schirmer I test (SIT),and another 25 healthy subjects were enrolled in this study.Then several parameters,including modulation transfer function cutoff (MTF cutoff),Strehl ratio (SR) and objective scattering index (OSI),were measured to evaluate the optical quality by using OQAS-Ⅱ.Additional clinical examination,including meibomian gland and tear film assessment were per formed and compared between the three groups.In addition,a correlation analysis was conducted among OSI,MTF cutoff,SR,BUT,SIT and meibomian gland assessment.Results Statistical differences were approached in MTF cutoff,SR,OSI of the three groups (all P ＜ 0.05).The MTF cutoff and SR in MGD without DED group were significantly lower than those in the control group [(31.36 + 1.83) c · deg-1 vs.(35.87 ± 1.59)c·deg-1,(0.21 +0.02) vs.(0.23 ±0.03)],but the OSI got higher [(0.57+ 0.06) vs.(0.45 ±± 0.06)] (all P ＜ 0.05).The SR and MTF cutoff in MGD patients with DED was significantly lower than those in MGD patients without DED [(27.87 ±± 3.08),c·deg-1 vs.(31.36±±1.83)c· deg-1,(0.16 ±±0.02) vs.(0.21 ± 0.02)],but OSIgot significantly higher [(0.72 ± 0.10) vs.(O.57 ± 0.06)] (all P ＜ 0.05).Among the three groups,OSI,MTF cutoff and SR showed no significant correlation with BUT,SIT and meibomian gland assessment (all P ＞ 0.05).Conclusion There is changes in visual quality parameters in MGD patients by OQAS-Ⅱ,and MGD with DED patients has significant changes than MGD patients without DED.
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Objective To evaluate the optical quality in patients with meibomian gland dysfunction (MGD) by using double-pass optical quality analysis system (OQAS-Ⅱ) for offering the reference data for clinical practices.Methods A total of 50 patients with a diagnosis of MGD,who were divided into MGD with dry eye disease (DED) group (n =22) and MGD without DED group (n =28) according to the results of tear film break-up time (BUT) and Schirmer I test (SIT),and another 25 healthy subjects were enrolled in this study.Then several parameters,including modulation transfer function cutoff (MTF cutoff),Strehl ratio (SR) and objective scattering index (OSI),were measured to evaluate the optical quality by using OQAS-Ⅱ.Additional clinical examination,including meibomian gland and tear film assessment were per formed and compared between the three groups.In addition,a correlation analysis was conducted among OSI,MTF cutoff,SR,BUT,SIT and meibomian gland assessment.Results Statistical differences were approached in MTF cutoff,SR,OSI of the three groups (all P ＜ 0.05).The MTF cutoff and SR in MGD without DED group were significantly lower than those in the control group [(31.36 + 1.83) c · deg-1 vs.(35.87 ± 1.59)c·deg-1,(0.21 +0.02) vs.(0.23 ±0.03)],but the OSI got higher [(0.57+ 0.06) vs.(0.45 ±± 0.06)] (all P ＜ 0.05).The SR and MTF cutoff in MGD patients with DED was significantly lower than those in MGD patients without DED [(27.87 ±± 3.08),c·deg-1 vs.(31.36±±1.83)c· deg-1,(0.16 ±±0.02) vs.(0.21 ± 0.02)],but OSIgot significantly higher [(0.72 ± 0.10) vs.(O.57 ± 0.06)] (all P ＜ 0.05).Among the three groups,OSI,MTF cutoff and SR showed no significant correlation with BUT,SIT and meibomian gland assessment (all P ＞ 0.05).Conclusion There is changes in visual quality parameters in MGD patients by OQAS-Ⅱ,and MGD with DED patients has significant changes than MGD patients without DED.
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Background The incidence of myopia is gradually increasing,and how to choose a better corrective method of myopia for the best visual demand is very important.Objective This study was to compare visual quality of implantable collamer lens (ICL) implantation with femtosecond laser in situ keratomileusis (FSLASIK) for moderate and high myopia using double-pass optical quality analysis system (OQAS).Methods A non-randomized controlled clinical trail was performed.Fifty-two eyes with-4.00 to-9.00 D of 26 consecutive patients were included in NO.1 Hospital of Xi'an from January 2015 to January 2016.Twenty-four eyes of 12 patients with the corneal thickness ＜500 μm received ICL implantation as ICL group and 28 eyes of 14 patients which corneal thickness was ≥500 μm underwent FS-LASIK surgery as FS-LASIK group.The demography was matched between the two groups (all at P＞0.05).All the patients were followed-up for 3 months after surgery.The preoperative best corrected distance visual acuity (BCDVA),spherical equivalent (SE),postoperative uncorrected distance visual acuity (UCDVA),BCDVA and SE were examined and compared between two groups.The parameters from OQAS were evaluated and intergrouply compared,including the objective scattering inders (OSI),modulation transfer function (MTF) cut off frequency,Strehl ratio and OQAS values under the contrast of 100％,20％ and 9％ (OV100,OV20,OV9).Results The postoperative BCDVA was not significantly different from preoperative UCDVA in both ICL group and FS-LASIK group (-0.04±t0.10 vs.0.05±0.12;-0.07±0.12 vs.0.00±0.12) (t=3.128,2.358,both at P＞0.05).No statistically significant differnces were found in SE,UCDVA and BCDVA after operation between ICL group and FS-LASIK group (t =1.292,0.900,-0.653,all at P＞0.05).OQAS examination showed that MTF cut off,OSI,Strehl ratio,OV100 were not significantly different after operation between ICL group and FS-LASIK group (t=-2.032,-1.440,-0.224,all at P＞0.05).The postoperative OV20 and OV9 were 0.82±0.14 and 0.80±0.21 in the ICL group,which were significantly higher than those in the FS-LASIK group(0.59±0.15 and 0.47±0.13) (t =4.105,4.702,both at P＜0.05).Conclusions Both ICL implantation and FS-LASIK provide good optical and visual quality for moderate to high myopic eyes,and ICL appears to have a better visual quality in comparison with FS-LASIK under the contrasts of 20％ and 9％.
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PURPOSE: We investigated the correlations between optical quality parameters obtained from the double-pass system and ocular aberrations obtained from the ray-tracing aberrometer in multifocal intraocular lens (IOL) implanted eyes. MATERIALS AND METHODS: Twenty eyes from 20 patients were enrolled in this study. Modulation transfer function cutoff frequency, The Strehl ratio, objective scatter index, and objective pseudo-accommodation obtained from the double-pass system were compared with root mean square (RMS) total aberration, RMS higher-order aberration, and spherical aberration obtained from the ray-tracing aberrometer. Additionally, parameters of the double-pass system and ray-tracing aberrometer were compared with manifested refraction values and subjective visual acuity, respectively. RESULTS: There was no statistically significant correlation between optical quality parameters obtained from the double-pass system and ocular aberrations, except between the Strehl ratio and RMS total aberration (r=-0.566, p=0.018). No significant correlations were found between the parameters of both devices, and manifested refraction values or subjective visual acuity. CONCLUSION: Optical quality parameters, especially the Strehl ratio, in multifocal IOL implanted eyes were affected by RMS total aberration. Further studies based on accurate measurements of ocular aberrations and additional optical quality parameters are needed to delineate relationships between optical quality parameters and ocular aberrations in multifocal IOL implanted eyes.
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Adult , Aged , Female , Humans , Male , Middle Aged , Cataract Extraction , Lens Implantation, Intraocular , Lenses, Intraocular , Refraction, Ocular , Visual AcuityABSTRACT
PURPOSE: To compare postoperative optical qualities between two types of 1-piece aspheric intraocular lenses using the double-pass technique. METHODS: Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), and spherical equivalent were evaluated in the subject groups; the first which included 25 eyes implanted with Tecnis(R) ZCB00 and the second which included 16 eyes implanted with Acrysof(R) IQ SN60WF. In addition, modulation transfer function (MTF) cut-off, Strehl ratio, and objective scattering index (OSI) were measured 6 months after cataract surgery in the 2 subject groups using Optical Quality Analysis System (OQAS, Visiometrics S.L., Terrasa, Barcelona, Spain) which is based on the double-pass technique. RESULTS: There were no significant differences in the spherical equivalent, UCVA, BCVA, and OSI between the 2 groups. However, both the MTF cut-off, and Strehl ratio showed statistically significant differences. The MTF cut-off (28.0 +/- 7.79 vs. 20.4 +/- 9.51 c/deg, p = 0.025) and Strehl ratio (0.14 +/- 0.04 vs. 0.12 +/- 0.05, p = 0.042) were higher in the Tecnis(R) ZCB00-implanted group. CONCLUSIONS: The difference in characteristics of intraocular lenses subtly affects the vision quality as measured by values such as MTF cut-off and Strehl ratio after cataract surgery. OQAS based on the double-pass technique is considered useful in more objective estimates of the real retinal image quality after cataract surgery which is difficult to explain simply by measuring visual acuity.