Good-Lite Good Lite ETDRS Original Series Chart R
"Features of the Good Lite ETDRS Original Series: Proportionally-spaced (geometric progression) lines line sizes range from 20/200 to 20/10 (6/60 to 6/3) equivalent. Standardized format used in National Eye Institute clinical studies and in low vision evaluations that require accurate and repeatable visual acuity measurements. Chart measures 24.5"" x 25.5"" (62 cm x 65 cm). 13 feet, 4 meter testing distance." crackcrackcrackcrack
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