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LEA SYMBOLS® CARDS 40M AND 60M
These five LEA SYMBOLS® Cards can be used for presentation as single optotypes or arranged in a row as a line test. When the cards are next to each other, the space between the symbols is equal to the width of the symbols. To determine the visual acuity, use the following formula:
VA = Viewing Distance Used(meters) / M-value
Dimensions: 60M cards - 8.6" x 8.6" (21.9 cm x 21.9 cm). 40M cards - 6" x 6" (15.25 cm x 15.25 cm).
256100
GOOD-LITE
card
16 In Stock
These five LEA SYMBOLS® Cards can be used for presentation as single optotypes or arranged in a row as a line test. When the cards are next to each other, the space between the symbols is equal to the width of the symbols. To determine the visual acuity, use the following formula:
VA = Viewing Distance Used(meters) / M-value
Dimensions: 60M cards - 8.6" x 8.6" (21.9 cm x 21.9 cm). 40M cards - 6" x 6" (15.25 cm x 15.25 cm).