Cards: LEA NUMBERS® Cards 40M and 60M

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These five LEA NUMBERS® 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 num bers is equal to the width of the symbols. To determine the visual acuity, use the following formula: VA = Viewing Distance Used (meters) / M-value LEA SYMBOLS®: The Gold Standard Show more