This calculator is intended as a convenient screener for visual acuity to be used on a mobile device and should not be used as a replacement for in-office testing. Evidence for smartphone apps for Snellen visual acuity is limited, and currently no app has been found to be accurate to within...
Visual acuityis the ability of the eye to identify a visual object. Visual acuity is most commonly assessed using the Snellen eye chart as follows: 1. Corrective lenses/pinhole. To accurately test visual acuity, ensure that the patient’s visual acuity is not altered byrefractive errors: errors...
The Snellen chart as a test of visual acuity - HetheringtonHetherington R. The Snellen chart as a test of visual acuity. Psychol Forsch 1954;24:349-357.Hetherington, R. (1954). The Snellen chart as a test of visual acuity. Psychologische Forschung, 24, 349-357....
Before measurement began, the whole class was briefed on the test procedure and were assured that we were not going to touch their eyes during testing. Distance habitual VA (with spectacles if worn) was measured using a single Bailey-Lovie LogMAR acuity chart at four metres, in a room well-...
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Visual acuity was measured by using Snellen chart at 6 meters in a properly illuminated room. Each eye was tested separately three times, and the best was taken. Those who had low vision were further evaluated by an ophthalmologist to know the diagnosis and for proper management. The study su...
(IVBI). Subsequently, bevacizumab was injected every 4 weeks until treatment responsiveness was achieved. Treatment response was defined as an increase in visual acuity of one or more Snellen lines (5 letter score) or a BCVA of 20/20, or a decrease in the CST by 10% or more, after ...
Visual acuity was measured on a Snellen chart and expressed as the logMAR. Based on VA levels, eyes were divided into 2 groups: eyes with a normal VA (logMAR, 0; Snellen equivalent, 20/20) and eyes with a decreased VA (logMAR, >0; Snellen equivalent, <20/20). Visual acuity and OCT...
Visual acuity is a commonly used method to check visual power, usually using the Snellen chart. It uses targets of very high contrast and measures spatial-resolving ability. However, Snellen acuity is a measure of only visual quantity and provides limited information about functional vision1. On ...
A second pilot trial and a second full-scale trial included patients with new subfoveal choroidal neovascular lesions secondary to AMD who had 20/100 to 20/800 (approximate Snellen equivalent) visual acuity in the affected eye. To be eligible for the AMD trials, patients had to be at least ...