Snellen Distance Vision Eye Chart 20 Ft Free Shipping
Price: $ 10.00
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These Snellen Eye Chart was originally introduced in 1862 by Herman Snellen. The Snellen eye Test uses the idea of subtended 5 minutes of arc with a 20 Feet distance. Also, Snellen developed the idea of a 5 x 5 grid for a standard for his optotypes.
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