ABSTRACT Objective: To study vertex-optical distance variation and estimate its impact on manifest refraction. Methods: Prospective study in a private clinic using the Vision-S™ 700 with five forehead positions. Forehead on the third position showed the closest vertex-optical distance of 12mm. Results: Analysis of 52 eyes from 26 patients revealed mean differences in vertex-optical distance of 12.25mm (right eye) and 11.75mm (left eye). A 2mm change in vertex-optical distance resulted in a 0.05D change for a 5D spherical equivalent and […]

ABSTRACT LASIK is a refractive surgical procedure in which a corneal flap is created to expose the corneal stromal bed. Preoperative estimation of corneal flap thickness is necessary to calculate the percentage tissue altered in LASIK, an important quantitative risk factor for ectasia. The objective of this study was to assess flap thickness and calculate percentage tissue altered to check if unexpectedly thicker flaps and higher percentage tissue altered could pose as risk factors of ectasia. Four subjects (eight eyes) […]

ABSTRACT Objective: The purpose of this study was to develop and apply an online questionnaire to assess knowledge in Refractive Surgery in the analyzed population. Methods: An online questionnaire was applied to a population composed of 840 volunteer participants over 18 years of age. Results: The mean age of population was 37.85 years, of whom 60.1% were female. 20.95% of the participants reported having undergone previous eye surgery, 73.86% of which had a refractive objective. Among these, 73.08% were satisfied […]

The objective of this article was to gather studies that report results available in the scientific literature, considering the predictability, safety, efficacy, and stability of posterior chamber phakic intraocular lenses. And report the documented complications for these lenses.

Objective: To evaluate the introduction of the femtosecond laser (FSL) to perform the key steps of the traditional cataract surgery process and the operational difficulties and safety of this new technology during routine use in an operating room in Brazil. Methods A retrospective study was conducted using the first cases operated on at a single center using the laser platform LenSx/Alcon with a soft contact lens patient interface.All patients underwent a detailed preoperative assessment.The anterior capsulotomy, nuclear fragmentation, and corneal […]

Objetivo: Avaliar a introdução do laser de femtossegundo (FSL) para realizar etapas fundamentais da cirurgia de catarata tradicional e as dificuldades e segurança desta nova tecnologia na rotina de um centro cirúrgico no Brasil. Métodos: Um estudo retrospectivo foi realizado com os primeiros casos operados em um único centro usando a plataforma de laser LenSx/Alcon, sendo utilizado lentes de contato gelatinosa na interface do paciente. Todos os pacientes foram submetidos a uma avaliação pré-operatória detalhada. Capsulotomia anterior, fragmentação nuclear e […]

Objetivo: Analisar a secreção lacrimal, coloração da superfície ocular e estabilidade do filme lacrimal em indivíduos submetidos à cirurgia de PRK e LASIK com laser de femtossegundo (femto LASIK). Métodos: Vinte olhos de 10 pacientes submetidos à técnica de Femto LASIK e 11 olhos de 6 pacientes submetidos à técnica de PRK foram estudados de forma prospectiva, longitudinal e intervencionista. Tempo de rotura do filme lacrimal (TRFL), teste de Schirmer basal e coloração da superfície ocular com lissamina verde foram […]

The phakic intraocular lenses (pIOLs) are a good option for the correction of high refractive errors. According to their anatomical position there are two types of pIOLs: anterior or posterior chamber. The anterior chamber pIOL may be iris-fixated or angle-supported. The iris-fixated pIOLs are available not only for myopia correction, but also for hyperopia and astigmatism. During the last decades many modifications on the pIOLs designs were proposed in order to reduce late complications, such as progressive endothelial cell loss. […]