Visual Acuity Tests

A. Checkerboard- the observer has to tell which checkerboard is different.
B. Landholt C- the observer has to identify the location of the gap, e.g.. top, left, right or bottom.
C. Grating- the observer has to indicate whether the grating is vertical or horizontal.
D. Snellen letters- the observer has to identify the letter. This is probably the best known test. With the letter shown, for example, if a person can not resolve the gap in the letter it could easily be confused for the letter P.

Visual Acuity Text

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