Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun display consisting of a printed card with letters and numbers in lines of decreasing size; used to test visual acuity

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[After Herman Snellen, (1834–1908), Dutch ophthalmologist.]

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Examples

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Comments

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  • Cover your right eye and read to me the third line of letters please.

    February 16, 2013