eye chart

noun
Ophthalmology. a chart for testing vision, typically containing letters, symbols, or pictures in rows of decreasing size that are to be read or identified at a fixed distance.

Origin:
1940–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

eye chart n.
A chart of letters and figures of various sizes, used to test visual acuity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The standard eye chart measures vision under conditions in which contrast is high.
According to him, he lied about his nearsightedness by memorizing the eye chart.
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