Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 12 de 12
Filtrar
1.
Vestn Oftalmol ; 140(2): 34-39, 2024.
Artigo em Russo | MEDLINE | ID: mdl-38742496

RESUMO

PURPOSE: This study evaluates the accuracy of modern intraocular lens (IOL) calculation formulas using axial length (AL) data obtained by ultrasound biometry (UBM) compared to the third-generation SRK/T calculator. MATERIAL AND METHODS: The study included 230 patients (267 eyes) with severe lens opacities that prevented optical biometry, who underwent phacoemulsification (PE) with IOL implantation. IOL power calculation according to the SRK/T formula was based on AL and anterior chamber depth obtained by UBM (Tomey Biometer Al-100) and keratometry on the Topcon KR 8800 autorefractometer. To adapt AL for new generation calculators - Barrett Universal II (BUII), Hill RBF ver. 3.0 (RBF), Kane and Ladas Super Formula (LSF) - the retinal thickness (0.20 mm) was added to the axial length determined by UBM, and then the optical power of the artificial lens was calculated. The mean error and its modulus value were used as criteria for the accuracy of IOL calculation. RESULTS: A significant difference (p=0.008) in the mean IOL calculation error was found between the formulas. Pairwise analysis revealed differences between SRK/T (-0.32±0.58 D) and other formulas - BUII (-0.16±0.52 D; p=0.014), RBF (-0.17±0.51 D; p=0.024), Kane (-0.17±0.52 D; p=0.029), but not with the LSF calculator (-0.19±0.53 D; p=0.071). No significant differences between the formulas were found in terms of mean error modulus (p=0.238). New generation calculators showed a more frequent success in hitting target refraction (within ±1.00 D in more than 95% of cases) than the SRK/T formula (86%). CONCLUSION: The proposed method of adding 0.20 mm to the AL determined by UBM allows using this parameter in modern IOL calculation formulas and improving the refractive results of PE, especially in eyes with non-standard anterior segment structure.


Assuntos
Biometria , Lentes Intraoculares , Facoemulsificação , Refração Ocular , Humanos , Biometria/métodos , Masculino , Feminino , Idoso , Pessoa de Meia-Idade , Reprodutibilidade dos Testes , Refração Ocular/fisiologia , Facoemulsificação/métodos , Comprimento Axial do Olho/diagnóstico por imagem , Implante de Lente Intraocular/métodos , Catarata/fisiopatologia , Catarata/diagnóstico , Óptica e Fotônica/métodos , Microscopia Acústica/métodos
2.
Vestn Oftalmol ; 139(5): 68-72, 2023.
Artigo em Russo | MEDLINE | ID: mdl-37942599

RESUMO

PURPOSE: The study assesses the influence of gender on the accuracy of intraocular lens (IOL) power calculation by formulas SRK/T, Barrett Universal II (BUII), Ladas super formula (LSF), Hill RBF (RBF) and Kane. MATERIAL AND METHODS: The study enrolled 214 patients (106 men and 108 women) who underwent cataract phacoemulsification (PE). Optical biometry was performed on IOL-Master 500. IOL power calculation was performed either adjusting for gender (formulas SRK/T, BUII, LSF) or without such adjustment (formulas RBF, Kane). Calculation error (CE) was assessed one month after PE by comparing the achieved (autorefractometer Topcon-8800) and target spherical equivalent of refraction. RESULTS: Significant differences were found in mean IOL CE with gender-unspecific formulas (SRK/T, BUII, LSF) and no differences in gender-specific calculators (RBF, Kane). The Kane formula demonstrated the lowest CE between men and women (-0.01±0.43 versus -0.09±0.41 D; p=0.158), while the SRK/T formula had the highest CE (0.02±0.46 versus -0.21±0.44 D, respectively; p<0.001). Presence of a significant correlation between CE and gender was found for all formulas except Kane (R2=0.005, p=0.158). CONCLUSION: Patient's gender has a significant impact on IOL calculation accuracy. Using gender-responsive formulas could help achieve better refractive results with PE. The present study showed Kane formula to have the least CE dependence from gender. However, the CE difference (less than 0.25 D) was lower than the value of division (0.5D) in modern IOL models.


Assuntos
Lentes Intraoculares , Facoemulsificação , Masculino , Humanos , Feminino , Acuidade Visual , Biometria/métodos , Óptica e Fotônica , Estudos Retrospectivos , Refração Ocular , Comprimento Axial do Olho
3.
Vestn Oftalmol ; 139(2): 52-60, 2023.
Artigo em Russo | MEDLINE | ID: mdl-37067932

RESUMO

PURPOSE: The study analyzes the frequency of acute endophthalmitis occurrence after cataract surgery, the risk factors, characteristic symptoms, and the effectiveness of peri-operative prevention measures. MATERIAL AND METHODS: The study retrospectively analyzed 59 670 cases of patients operated for cataract in 2017-2021. To prevent infections, patients received four instillations of third generation fluoroquinolone (quinolone antibiotic) in the course of two days prior to cataract phacoemulsification (PE), and two instillations immediately (1 hour and 30 minutes) before the surgery; three-minutes treatment of the cornea, conjunctival sac and periocular skin with 5% povidone iodine before the surgery; and as the last step of surgery, patients received subconjunctival injection of 0.05 g cefazolin with 2 mg dexamethasone. Follow-up after surgery included four injections of 0.5% levofloxacin in the course of 7-10 days, and 0.1% dexamethasone for two weeks, or fixed combination of tobramycin and dexamethasone four times per day for two weeks. The criteria for acute endophthalmitis are: loss of spatial vision, absence of red reflex, pronounced thickening of the choroid, suspended particulates in the retrovitreal space and the vitreous observed with ultrasonography in the early postoperative period (day 4-7 after surgery). RESULTS AND DISCUSSION: There were 32 patients (0.054%) diagnosed with acute endophthalmitis. Posterior capsule rupture was the main complicative risk factor of endophthalmitis development (OR=11.75, p=0.026). Main diagnostic criteria of acute endophthalmitis were hypopyon (OR=22.5, p=0.001) and absence of red reflex (OR=19.59, p<0.001). The use of the fixed combination of tobramycin and dexamethasone was associated with 5.8-times higher risk of acute endophthalmitis than separate application of levofloxacin and dexamethasone (p=0.042). CONCLUSIONS: Povidone iodine and third generation fluoroquinolone as a method of acute endophthalmitis prevention after cataract surgery demonstrate comparable efficacy to intracameral antibiotic injections.


Assuntos
Extração de Catarata , Catarata , Endoftalmite , Infecções Oculares Bacterianas , Humanos , Levofloxacino/uso terapêutico , Povidona-Iodo/uso terapêutico , Estudos Retrospectivos , Complicações Pós-Operatórias/diagnóstico , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/prevenção & controle , Antibacterianos , Extração de Catarata/efeitos adversos , Endoftalmite/diagnóstico , Endoftalmite/epidemiologia , Endoftalmite/etiologia , Dexametasona/uso terapêutico , Tobramicina/uso terapêutico , Catarata/complicações , Infecções Oculares Bacterianas/diagnóstico , Infecções Oculares Bacterianas/epidemiologia , Infecções Oculares Bacterianas/etiologia
4.
Vestn Oftalmol ; 138(3): 24-28, 2022.
Artigo em Russo | MEDLINE | ID: mdl-35801876

RESUMO

PURPOSE: To develop an alternative method of intraocular lens (IOL) power calculation in eyes with mature cataract and axial length (AL) of less than 22.0 mm using modern formulas Barrett Universal II and Hill RBF. MATERIAL AND METHODS: The study enrolled 41 patients (41 eyes) who underwent phacoemulsification (PE). Ultrasound biometry (Tomey Biometer Al-100) and keratometry (Topcon-8800) were used for IOL power calculation by SRK/T and Haigis formulas. To calculate IOL power by Barrett Universal II and Hill RBF formulas, 0.2 mm were added to AL measured with ultrasonography (retinal thickness). One month after PE, spherical equivalent of refraction was compared with target refraction (calculated by the formulas listed above), and based on that a conclusion was made on the accuracy of calculations. RESULTS: Haigis formula was found to be the least accurate (IOL calculation error -0.39±0.79 D). The calculation error in SRK/T (0.04±0.79 D), Barrett Universal II (0.02±0.79 D) and Hill RBF (-0.05±0.73 D) formulas was much lower. However, among them Hill RBF had the lowest spread of the mean absolute IOL calculation error. Pairwise comparison revealed significant difference of mean IOL calculation error by Haigis formula versus the others. There was no significant difference in the following pairs: SRK/T - Barrett Universal II (p=0.855), and SRK/T - Hill RBF (p=0.167), but there was a significant difference (p=0.043) in the Barrett Universal II - Hill RBF pairdue to the tendency for slight hypermetropic calculation error in the former and the inherent slight myopic shift in the latter.. CONCLUSION: The proposed alternative method of IOL power calculation in eyes with mature cataract and short AL using modern formulas (Barrett Universal II and Hill RBF) shows higher accuracy compared to the formulas embedded in ultrasound biometer (SRK/T and Haigis), and can be recommended for use in everyday practice.


Assuntos
Catarata , Lentes Intraoculares , Facoemulsificação , Comprimento Axial do Olho/diagnóstico por imagem , Biometria/métodos , Catarata/diagnóstico , Humanos , Implante de Lente Intraocular , Óptica e Fotônica , Refração Ocular , Estudos Retrospectivos
5.
Vestn Oftalmol ; 137(6): 61-66, 2021.
Artigo em Russo | MEDLINE | ID: mdl-34965069

RESUMO

PURPOSE: To assess biometric changes in eyes after trabeculectomy (TE) and its impact on refractive outcomes of phacoemulsification (PE) in order to determine the corrections for calculation of intraocular lens (IOL) power. MATERIAL AND METHODS: The study included two groups of patients: the 1st group consisted of 116 patients who were assessed by optical biometry (IOL-Master 500) for mean biometric values before and after TE; the 2nd group included 31 patients with history of TE (study subgroup) and 47 individuals without glaucoma (control subgroup) who underwent PE with subsequent comparison of IOL calculation accuracy. RESULTS: There was significant axial length (AL) shortening in the 1st group from 23.28±0.97 to 23.19±0.97 mm (p<0.001) 6 months after TE, which positively correlated (r=0.296, p=0.001) with intraocular pressure (IOP) decrease (from 25.4±5.34 to 17.2±4.42 mm Hg, p<0.001). Mean keratometry and anterior chamber depth values did not significantly change after TE. Mean IOL power calculation error after PE in the 2nd group was -0.05±0.47 D and 0.003±0.62 D for the control and study subgroups, respectively (p=0.697). However, significant impact of preoperative IOP on IOL power calculation error was discovered in the study subgroup (R2=0.526, p<0.001), but not in the control subgroup (R2=0.061, p=0.052). Based on linear regression, the expected IOL power calculation errors depending on the preoperative IOP were determined for patients with history of TE. CONCLUSION: AL shortening due to decrease in IOP in patients with history of TE leads to IOL power calculation errors. Expected IOL calculation error related to preoperative IOP level was determined, which could help improve refractive outcomes of PE in patients with history of TE.


Assuntos
Lentes Intraoculares , Facoemulsificação , Trabeculectomia , Biometria , Córnea , Humanos , Implante de Lente Intraocular , Facoemulsificação/efeitos adversos , Refração Ocular , Estudos Retrospectivos
6.
Vestn Oftalmol ; 137(4): 38-42, 2021.
Artigo em Russo | MEDLINE | ID: mdl-34410055

RESUMO

PURPOSE: To assess the impact of pseudoexfoliation syndrome (PEX) on the accuracy of intraocular lens (IOL) power calculation. MATERIAL AND METHODS: The study included 243 patients who underwent phacoemulsification (PE); they were divided into the control (no PEX signs, n=131) and study (signs of PEX, n=112) groups. Barrett Universal II formula was used for IOL calculation by optical biometry (IOL-Master 500). Obtained refraction (autorefractometer Topcon-8800) was compared with target refraction to assess IOL calculation accuracy 1 month after PE. RESULTS: Patients with PEX had significantly shallower anterior chamber compared to the control group (2.86±0.43 versus 3.0±0.43 mm, p=0.003) and steeper corneal curvature (44.31±1.5 versus 43.7±2.59 D, p=0.052). There was significant difference in absolute error of IOL calculation between the groups (-0.02±0.45 versus 0.17±0.55 D for control and study groups, respectively, p=0.004). There was no difference in IOL calculation error depending on the implanted IOL models (AcrySof SA60AT and Akreos Adapt AO) in the control group. However, implantation of SA60AT in the study group showed significant difference in IOL calculation error compared with Akreos (0.3±0.57 versus 0.04±0.51 D, p=0.01). Using linear regression, optimized A-constants were suggested for these types of IOLs for patients with PEX (118.83 for SA60AT and 118.44 for Akreos).


Assuntos
Síndrome de Exfoliação , Lentes Intraoculares , Facoemulsificação , Biometria , Síndrome de Exfoliação/diagnóstico , Humanos , Implante de Lente Intraocular , Refração Ocular , Estudos Retrospectivos
7.
Vestn Oftalmol ; 137(2): 52-58, 2021.
Artigo em Russo | MEDLINE | ID: mdl-33881263

RESUMO

According to literature data, some experts do not exclude the possibility that scleral lens wear could influence intraocular pressure. PURPOSE: To evaluate the influence of rigid gas permeable miniscleral contact lenses on intraocular pressure (IOP), keratometry readings and corneal thickness, and to study the correlation between scleral (IOPs) and corneal (IOPc) intraocular pressure using the Icare ic100 tonometer (model TAO11, Icare Finland Oy). MATERIAL AND METHODS: The study included 99 volunteers without history of ocular diseases. The first group consisted of 66 participants (122 eyes) aged 22.3±2.2 years - IOPc and IOPs were measured by the Icare ic100 tonometer in order to determine the correlation. The second group (33 participants, aged 22.7±1.7 years) - day 1, diurnal IOPc and IOPs fluctuations were measured; on day 2, a miniscleral lens (diameter 14.9 mm) was placed on the study eye and was worn for 6 hours, the paired eye served as control. IOP was measured before, after lens placement, after 2 hours of lens wear, and before and after lens removal. Corneal topography was evaluated before and after lens removal. RESULTS: In the first group, there was a weak but significant correlation between IOPc and IOPs (Spearman correlation coefficient 0.285, p=0.001). In the second group, IOPc in the study eye before lens placement (14.8±3.8 mm Hg) and IOPc after its removal (13.6±3.9 mm Hg) were not different from those in the control eye. There were also no statistically significant changes in IOPs before, during lens wear, and after lens removal. The central corneal thickness increased by 2.9% (p<0.001) after 6 hours of lens wear. CONCLUSION: In young individuals without history of ocular diseases, wearing the miniscleral lens for 6 hours does not have significant influence on IOP and does not cause clinically significant corneal edema.


Assuntos
Lentes de Contato , Pressão Intraocular , Adulto , Lentes de Contato/efeitos adversos , Córnea , Topografia da Córnea , Humanos , Tonometria Ocular , Adulto Jovem
8.
Vestn Oftalmol ; 122(2): 21-4, 2006.
Artigo em Russo | MEDLINE | ID: mdl-16886745

RESUMO

The purpose of the study was to analyze the pattern and frequency of complications following 230 implants of porous polytetrafluoroethylene (PTFE) orbital inserts. The total frequency of the complications to be treated was 7.4%. Among them there were pointed conjunctival perforations during enucleation (1.3%); early exposures of orbital inserts due to surgical defects (2%); late exposures caused by the planned replacement of an old prosthesis by a new one that had proved to be poorly adjusted (1.4%); significant bleapharoptosis (2%); lower eyelid atony (0.7%). Noteworthy is the fact that there were no infectious complications. Thus, implantation of PTFE orbital inserts is attended by a very narrow range of the complications, which are typical of this branch of ophthalmosurgery, whose frequency is not greater than the use of implants made from other porous materials.


Assuntos
Anoftalmia/cirurgia , Materiais Biocompatíveis , Implantes Orbitários , Politetrafluoretileno , Complicações Pós-Operatórias , Implantação de Prótese/efeitos adversos , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Seguimentos , Humanos , Incidência , Pessoa de Meia-Idade , Porosidade , Desenho de Prótese
9.
Vestn Oftalmol ; 122(2): 18-21, 2006.
Artigo em Russo | MEDLINE | ID: mdl-16886744

RESUMO

This paper presents the outcomes of 230 primary, advanced, and secondary implants of polytetrafluoroethylene orbital inserts manufactured by the closed joint stock company "Nauchno-Proizvodstvennyi Kompleks (Scientific-and-Production Complex) "Ekoflon" (Saint Petersburg). The duration of a follow-up was 6-36 months (mean 15.9 +/- 037 months). The accumulated experience suggests that polytetrafluoroethylene orbital inserts are noted for their biocompatibility, easiness of manual treatment, and simplicity of implantation. Thus, porous polytetrafluoroethylene orbital inserts are promising medical articles designed for the prevention and treatment of the anophthalmic syndrome.


Assuntos
Anoftalmia/cirurgia , Materiais Biocompatíveis , Implantes Orbitários , Politetrafluoretileno , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Seguimentos , Humanos , Pessoa de Meia-Idade , Porosidade , Desenho de Prótese , Resultado do Tratamento
10.
Vestn Oftalmol ; 115(2): 5-7, 1999.
Artigo em Russo | MEDLINE | ID: mdl-10377863

RESUMO

Results of treatment of 40 patients (43 eyes) with foreign bodies in the posterior segment of the eye are discussed. Special attention is paid to correct assessment of the risk and efficacy of removal of a fragment in each case. Only 67.5% of patients presented with obvious indications for removal of a foreign body through the vitreous. Fragments were removed in 83.3% of these patients. Complications occurred in 6.6%. The main causes of failure of sparing removal of a foreign body from the posterior segment of the eye were detachment of the retina and hemophthalmia.


Assuntos
Corpos Estranhos no Olho/cirurgia , Ferimentos Oculares Penetrantes/cirurgia , Procedimentos Cirúrgicos Oftalmológicos/métodos , Corpo Vítreo/cirurgia , Adolescente , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias , Estudos Retrospectivos , Resultado do Tratamento , Corpo Vítreo/lesões
11.
Vestn Oftalmol ; 114(2): 17-20, 1998.
Artigo em Russo | MEDLINE | ID: mdl-9621814

RESUMO

Clinical picture, variants of surgical treatment, and anatomic and functional outcomes of contusion ruptures of the eyeball at the site of postoperative corneolimbic cicatrices are described. Such traumas can occur even 9-10 years after keratotomy. The majority of unfavorable outcomes in such patients are due to retinal and vitreous abnormalities, such as hemophthalmia or detachment of the retina. Ruptures of corneolimbic cicatrices in patients after cataract extraction with or without implantation of intraocular lenses are more frequent during the first months after surgery; an indirect contusion is sufficient to cause them. The incidence of fibrous capsule ruptures does not depend on the localization of the cicatrice and type of suture. Ruptures of cicatrices on artiphakic eyes almost always involve falling of intraocular lenses into the wound. An intact diaphragmatic function of the iris and transparent optic media are prognostically favorable factors in such patients.


Assuntos
Extração de Catarata/efeitos adversos , Cicatriz/complicações , Contusões , Traumatismos Oculares , Ceratotomia Radial/efeitos adversos , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Implante de Lente Intraocular/efeitos adversos , Masculino , Pessoa de Meia-Idade , Prognóstico , Ruptura , Fatores de Tempo
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...