ETDRS eye chart - 2000 Series sloan letter vision chart 1 with proportionally spaced (geometric progression) lines; line sizes range from 20/200 to 20/10 (6/60 to 6/3) equivalent. Revised version of the original ETDRS series with each line being equally difficult. Chart measures 24.5" x 25.5" (62 cm x 65 cm)
13 feet, 4 meter testing distance
Przelicznik skali Decimal/Snellen
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