Sloan Letter Proportionally Spaced Distance Charts800740
A Sloan Letter Distance Chart with proportionally spaced (logMAR) lines; line sizes range from 20/100 to 20/10 (6/30 to 6/3). This chart can be used in an illuminated ESV1018 or hung on the wall.
Dimensions: 10" x 18" (25.4 cm x 45.7 cm).
Testing distance: 20 feet/6 meters.