ETDRS远用视力表-字母(500018)
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ETDRS 2000 Series Chart 3
2000 Series ETDRS sloan letter vision chart 3 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
规格
500018
品牌
GOOD-LITE(美国）
