A double-sided Standard Snellen Chart for testing at 20 ft and 10 ft based on a visual angle of one minute. The front side has a 20 ft Snellen Chart with M notations and the back side has a 10 ft chart. Includes lines for 20/10, 20/13, 20/15, 20/20, 20/25, 20/30, 20/40, 20/50, 20/70, 20/100, and 20/200. The green bar is at 20/30 and the red bar is at 20/20.

Dimensions: 23.5” x 11” (60 cm x 28 cm).