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

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

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

    February 16, 2013