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Adult Original Series ETDRS, Sloan Letter vision chart 2 can be displayed in the illuminating light box with the chart having proportionally spaced (geometric progression) lines; line sizes range from 20/200 to 20/10 (6/60 to 6/3) equivalent.
Chart measures 24.5″ x 25.5″ (62 cm x 65 cm). 13 feet, 4 meter testing distance.