American Heritage® Dictionary of the English Language, Fourth Edition
- n. A chart for testing visual acuity, usually consisting of letters, numbers, or pictures printed in lines of decreasing size which a patient is asked to read or identify at a fixed distance.
- n. display consisting of a printed card with letters and numbers in lines of decreasing size; used to test visual acuity
- After Herman Snellen (1834-1908), Dutch ophthalmologist. (American Heritage® Dictionary of the English Language, Fourth Edition)
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