The distance between the screener and the student (usually 6 metres) should be measured and marked appropriately. The student’s chair may move around, so make a mark on the floor where the front legs of the chair should be. Check that the chair is in the right place before assessing each child. If using a standard, unlit visual acuity chart, the room should be well lit, taking care to avoid ref...

PURPOSE THE PURPOSE OF THIS STUDY WAS TWOFOLD first, to prospectively compare visual acuity (VA) scores obtained with Snellen charts versus Early Treatment Diabetic Retinopathy Study (ETDRS) charts in a "real world" retinal practice, and second, to see if there was a difference in visual acuity measurements obtained with ETDRS charts starting at 4 or 2 meters. METHODS Prospective, consecut...

Posterior capsular opacification Yag laser PCIOL Pupil Visual acuity Cataract is one of the most leading cause of curable blindness all over world. In the developing word most popular method of cataract operation is extra capsular cataract extraction (ECCE) with posterior chamber into ocular lens in plantation eye (PCIOL) by Various Methods. This hold true for our county and Rajasthan state too...

The extent to which age-related differences in neural markers of visual processing are influenced by changes in visual acuity has not been systematically investigated. Studies often indicate that their subjects had normal or corrected-to-normal vision, but the assessment of visual acuity seems to most frequently be based only on self-report. Consistent with prior research, to be included in the...

OBJECTIVE To evaluate changes in visual acuity (VA) over time in patients with Leber congenital amaurosis (LCA) and mutations in the CEP290 gene. METHODS Visual acuity was determined at the initial and most recent visits of 43 patients with LCA and CEP290 mutations. The main outcome measures included the best-corrected VA at the initial and most recent visits, as well as the correlation betwe...

OBJECTIVE To examine the characteristics and visual outcome in 207 patients with retinal vasculitis. METHODS Demographic and visual outcome data were collected retrospectively from the ophthalmologic records of 207 cases (321 affected eyes). Descriptive analysis was performed on all cases and visual outcome analysis was performed for the 114 cases with visual acuity recorded at 2 or more visi...

line of threshold acuity and perhaps especially if the first eye assessed has the better acuity. In addition, routinely asking subjects to read from the top line increases the frequency of exposure to the letters and the level of passive memory that can be developed. Consequently, if the best of multiple measures is enhanced by passive memory, any apparent deterioration at a subsequent examinat...

Citation: Shah N, Dakin SC, Whitaker HL, Anderson RS. Effect of scoring and termination rules on test–retest variability of a novel high-pass letter acuity chart. Invest Ophthalmol Vis Sci. 2014;55:1386–1392. DOI: 10.1167/iovs.13-13340 PURPOSE. Test–retest variability (TRV) limits our ability to detect clinically significant changes in visual acuity (VA). We wanted to compare the effect of scor...

OBJECTIVES To examine the association between visual and hearing impairment and motor vehicle collision (MVC) involvement in older drivers. DESIGN Retrospective cohort study. SETTING North central Alabama. PARTICIPANTS Population-based sample of 2,000 licensed-drivers aged 70 and older. MEASUREMENTS Visual acuity was measured using the Electronic Visual Acuity test. Contrast sensitivity...