Snellen Type Plastic Eye Chart-20'

Non-Reflective Matte Finish with Green and Red Color Bars.
To Be Read from a 20' Distance.
Chart Size: 22" x 11"

The Snellen 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; how well you can see things that are far away.