Snellenchart

Snellenchart
Snel·len chart (snĕlʹən) 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.
  [After HermanSnellen (1834-1908), Dutch ophthalmologist.]

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Universalium. 2010.

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