E and C Charts, ETDRS, Clinical Trial Chart for ESV3000 and ESC2000500060
E and C Clinical Trial Charts, ETDRS, vision chart with 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).
E and C Charts, openings are found at the up, down, left & right position only.
10 feet, 3 meter testing distance.