Snellen chart


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Snel·len chart

 (snĕl′ən)
n.
A chart for testing visual acuity, usually consisting of letters, numbers, or pictures printed in lines of decreasing size that a patient identifies from a fixed distance.

[After Herman Snellen (1834-1908), Dutch ophthalmologist.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Snellen chart - display consisting of a printed card with letters and numbers in lines of decreasing size; used to test visual acuity
display, presentation - a visual representation of something
References in periodicals archive ?
After refraction measurements were performed, BCVA was tested in all cases using the Snellen chart.
Visual acuity was measured using Snellen chart, E chart or broken ring chart with and without glasses.
Increase in the post-treatment visual acuity of at least one meter when counting fingers (CF) or one line on the Snellen chart was considered as improvement in visual acuity.
The study tools used were a structured interview schedule, Snellen chart, Roman test type chart, measuring tape, eye shield, torch light, and pinhole.
1% of the patients having had the symptoms for less than 6 months before meningioma surgery, with a significant VA improvement of more than 20% (two Snellen chart lines) in 41.
2) The new form no longer requires the driver's signature, blood-pressure reading, visual acuity test using the Snellen chart to determine the driver's eyesight condition, the first endorsement of LTO branch chief prior to the conduct of medical examination, and the official receipt of payment by the driver for the medical examination-unlike the old form.
With one eye covered, they were then instructed to read the letters on the Snellen chart beginning from the top and largest letter and proceeding to the smallest line they could read.
Nonetheless to allow for comparison with the literature, (5) we also calculated the frequency of uncorrected DVI in the current sample using 20/40 or worse on the Snellen Chart, the same cutoff as used by these authors.
Vision should be tested using a Snellen chart in suspected corneal ulcer.
Snellen chart is used for testing the vision, with the standard Snellen chart, vision is tested at a distance of 6 meters or 20 feet.
9) The course covered social interaction, basic anatomy, physiology, optics, data collection and VA screening using an Illiterate E Snellen Chart.