OBJECTIVE To determine the prevalence and causes of visual impairment in the Meiktila district of central, rural Myanmar. DESIGN Population-based cross-sectional study. PARTICIPANTS Random, stratified, cluster sampling of the inhabitants 40 years of age and older from villages in the Meiktila district was performed; 2481 eligible participants were identified and 2076 participated in the stu...

Background: As There is not accurate information about ocular defects in Thalassemia Major (TM) patients in Mazandaran province ,this study was designed to assess the prevalence of ophtalmopathies in thalassemic patients and also recognize its relevant factors in Sari Boo Ali Sina hospital. Sari. Materials and Methods: This descriptive Cross-sectional was Carried out on 60 TM patients in Thalas...

IMPORTANCE Establishing the natural history of G11778A Leber hereditary optic neuropathy (LHON) is important to determine the optimal end points to assess the safety and efficacy of a planned gene therapy trial. OBJECTIVE To use the results of the present natural history study of patients with G11778A LHON to plan a gene therapy clinical trial that will use allotopic expression by delivering a ...

For assessing tactile spatial resolution it has recently been recommended to use tactile acuity charts which follow the design principles of the Snellen letter charts for visual acuity and involve active touch. However, it is currently unknown whether acuity thresholds obtained with this newly developed psychophysical procedure are in accordance with established measures of tactile acuity that ...

PURPOSE To compare the relationship between logMAR visual acuity (VA) and cataract severity and between contrast sensitivity (CS) and cataract severity in pure types of age-related lens opacities. METHODS Analysis included patients followed in the ongoing Italian-American Study of the Natural History of Age-Related Cataract. Lens opacities were classified and graded according to the Lens Opac...

PURPOSE This study investigated whether visual perceptual learning can improve near visual acuity and reduce foveal crowding effects in four- to nine-year-old children with visual impairment. METHODS Participants were 45 children with visual impairment and 29 children with normal vision. Children with visual impairment were divided into three groups: a magnifier group (n = 12), a crowded perc...

PURPOSE To assess the prevalence and causes of visual impairment in the elderly Bai ethnic group in rural China. METHODS Random cluster sampling was used to identify the Bai ethnic group 50 years and older living in the Dali county of Yunnan, China. Presenting visual acuity (PVA) and best-corrected visual acuity (BCVA) were measured using the Early Treatment Diabetic Retinopathy Study visual ...

OBJECTIVE To describe visual acuity outcomes of patients in the Ischemic Optic Neuropathy Decompression Trial (IONDT) after 24 months of follow-up. DESIGN The IONDT is a single-masked, multicenter, randomized clinical trial. SETTINGS Patients were evaluated and followed up at 25 clinical centers located throughout the United States. Data were sent to and analyzed at a central coordinating c...

Background: Visual impairment affects up to 70% of stroke survivors. We designed an app (StrokeVision) to facilitate screening for common post stroke visual issues (acuity, visual fields, and visual inattention). We sought to describe the test time, feasibility, acceptability, and accuracy of our app-based digital visual assessments against (a) current methods used for bedside screening and (b)...