Snellen test

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Snellen test

A test for visual acuity using a Snellen chart.

Snellen test

Etymology: Hermann Snellen

a test of visual acuity using a Snellen chart. The person being tested stands 20 feet from the chart and reads as many of the symbols as possible, reading each line and proceeding downward from the top. A score is assigned in the form of a ratio, comparing the subject's performance to that of a statistically normal subject's performance. For example, a person who can read at 20 feet what the average person can read at this distance has 20/20 vision, whereas a person who can read at 20 feet what the average person can read at 40 feet has 20/40 vision.

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blind chart legal blindness			The Snellen test gives a false sense of security to parents and teachers that vision is normal, and serious problems, not revealed in an eye chart test, can go overlooked. The Eye Chart Does More Harm Than Good by Getz, Donald J. / Special Delivery They also perform the standardized Snellen test, during which the patient covers one eye at a time and identifies letters on a chart from 20 feet away. Q & A\Advice from experts\Children need more frequent eye exams by Daily News (Los Angeles, CA)			snake's head snakebite snakeroot snakes, fear of snakeweed snap snapper snapping hip snare snatch SND Sneaky Mating Sneddon syndrome Sneddon's syndrome sneeze sneezeweed sneezing Sneezing Gas sneha snehan snehana Snell Snell-Sterling visual efficiency scale Snellen chart Snellen fraction Snellen test Snellen's reflex Snellen's test types SNF Sniffer Dog Sniffing Dog Position snigdha snip SNOMED SNOMED International snood Snook hook Snoopy Cap snore snoring Snort snorter dwarf Snorting Snortometer Snorts snot snotsiekte snout snout reflex SNOVET Snow			snell snell Snell Farm Children's Center Snell law Snell law Snell laws of refraction Snell Memorial Foundation Snell Memorial Foundation Snell Memorial Foundation Snell's law Snell's law Snell's law Snell, Bertrand Hollis Snell, George D. Snell, George Davis Snell, Willebrord Snell-Sterling efficiency scale Snell-Sterling visual efficiency scale Snell-Zimmerman-Timmerman SNELLA snelled snelled Snellen Snellen chart Snellen chart Snellen chart Snellen chart types Snellen chart types Snellen fraction Snellen fraction Snellen test Snellen tests Snellen tests Snellen tests Snellen's chart Snellen's chart Snellen's chart Snellen's chart Snellen's chart Snellen's reflex Snellen's test types Snelling Snelling Snelling University Capacity Study Snelling, Fort Snellius, Willebrord Snellmann, Johan Vilhelm snells snells Snells law Snells law Snellville Middle School SNELPIF Snelson Golden Middle School SNEM SNEME SNEMSA SNENNP SNENUG SNEP SNEPCO

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