visual acuity


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visual acuity

[′vizh·ə·wəl ə′kyü·əd·ē]
(physiology)
The ability to see fine details of an object; specifically, the ability to see an object whose angle subtended at the eye is 1 minute of arc.

visual acuity

A measure of the ability to distinguish fine details; the reciprocal of the angular size of critical detail which is just large enough to be seen.
References in periodicals archive ?
Postoperative Uncorrected Visual Acuity vs Preoperative Best Corrected Visual Acuity with the WaveLight Refractive Suite
With respect to adverse events, only 7% of patients, at their last study exam, had visual acuity loss of more than 2 lines in telescope implanted eyes.
The inclusion criteria were: (1) aged over 65 years; (2) bilateral AMD (either neovascular or "wet" AMD) or geographic atrophy (that is, "dry" AMD); (3) best corrected visual acuity worse than 20/70 in the better-seeing eye; (4) more than five anti-vascular endothelial growth factor (VEGF) injections if the better eye had "wet" AMD; (5) subthreshold depressive symptoms (defined as a Patient Health Questionnaire-9 score [greater than or equal to] 5 or depressed mood or anhedonia several days per week; and (6) moderate difficulty performing a valued vision-dependent activity.
TM-24-13 introduces the Equivalent Visual Efficiency (EVE) method, which uses equivalent visual acuity as a baseline for determining light levels for Visually Demanding Tasks.
All patients underwent a routine pre-operative assessment, with measurement of visual acuity, dilated slit-lamp examination of the anterior segment, measurement of the intra-ocular pressure by Goldmann applanation tonometry, A-scan biometry, and fundus examination with either a 90-dioptre lens and indirect ophthalmoscope or B-scan ultrasound.
Scores reflect the difference in visual acuity between stable head and moving head [10-11].
It was concluded that the preserved photoreceptor layer is associated with a higher and better corrected visual acuity compared with granulated photoreceptor layer.
The visual acuity testing in the current study found 97 percent of all nearsightedness cases but "many children with clinically significant levels of hyperopia and astigmatism would not be referred for treatment.
At baseline, the patients' mean Snellen visual acuity was 20/135.
5 mg ranibizumab had a gain of 15 letters or more in visual acuity compared to 5 percent of patients in the placebo controlled group.
These patients reported reduced visual acuity and metamorphopsia, i.
Vision is described in terms of visual acuity and field of vision Visual acuity is a measure of how well an individual sees compared with someone with normal sight--for example, a person with 20/60 vision must be within 20 feet of an object to see it as clearly as a normal-sighted person at 60 feet--and a normal field of vision is 160 to 170 degrees.