Graham-Field 1240 Grafco Snellen Eye Chart, Plastic with Non-Reflective Matte Finish, 22" x 11"
Snellen wall eye chart is the familiar chart with the big letter or symbol at the top and progressively smaller letters at the bottom of the chart down to 20/20 or better. This is a chart for measuring visual acuity at a distance - in other words, how well you can see things that are far away.
