View clinical trials related to Refractive Error.
Filter by:Myopia has emerged as a major health issue in east Asia, because of its increasingly high prevalence in the past few decades (now 80-90% in school-leavers), and because of the sight-threatening pathologies associated with high myopia, which now aff ects 10-20% of those completing secondary schooling in this part of the world. Similar, but less marked, changes are occurring in other parts of the world. The higher prevalence of myopia in east Asian cities seems to be associated with increasing educational pressures, combined with life-style changes, which have reduced the time children spend outside.
The Baltimore Reading and Eye Disease Study (BREDS) is a two year study to determine the prevalence of vision problems in an early school age population with reading difficulty. Comprehensive vision and reading tests will be administered to 400 students at participating schools in the Baltimore City Public School system. A secondary goal is to examine the impact of vision treatment on reading performance. Children with refractive error or convergence insufficiency will be provided treatment free of charge. The investigators will evaluate the impact that the treatment has on vision function and reading performance.
The purpose of this study is to evaluate the tear film evaporation of symptomatic soft contact lens wearers in the absence of contact lens wear and after at least 8 hours of contact lens wear.
The purpose of this study is to evaluate cholesterol sorption by Air Optix® Aqua lenses compared to ULTRA lenses after 30 days of wear.
The aim of this study is to assess the visual performance of multiple optimised prototype soft contact lens designs compared to commercially available contact lenses.
The purpose of this study is to evaluate Clear Care® Plus compared to PeroxiClear™ for mean residual peroxide in used lens cases collected at Day 30.
The purpose of this study is to measure the coefficient of friction of three silicone hydrogel daily disposable contact lenses (1-DAY ACUVUE® TruEye®, MyDay™ and clariti® 1day) after 16 hours of wear.
The purpose of this study is to evaluate the functional vision of 2 daily disposable silicone hydrogel contact lenses using Time Controlled Visual Acuity (TCVA) measurements at high luminance and high contrast after 10+/-3 days of wear post 3 hour exposure to a reduced humidity environment.
The purpose of this study is to evaluate the thickness of the pre-lens tear lipid layer after 2 hours of lens wear with use of FID 114657 compared to saline control.
The purpose of this study is to evaluate the pre lens tear film characteristics of DAILIES® Aqua Comfort Plus® Multifocal (DACP MF) and Toric (DACP Toric) compared to DAILIES® Aqua Comfort Plus® Sphere (DACP) daily disposable contact lenses over 12 hours of lens wear.