Sloan Letter Proportionally Spaced Distance Chart
SLOAN Letter translucent eye chart with proportionally spaced (logMAR) lines; line sizes range from 20/160 to 20/10 (6/48 to 6/3) equivalent. This chart can be used in Good-Lite's illuminated ESV1018 or hung on the wall. Chart size is 10"x18" (25.4 cm x 45.7 cm).
13 feet, 4 meters testing distance.