Search Result for "snellen chart":
Wordnet 3.0

NOUN (1)

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



WordNet (r) 3.0 (2006):

Snellen chart
    n 1: display consisting of a printed card with letters and
         numbers in lines of decreasing size; used to test visual
         acuity