Snellen Distance Vision Eye Chart 20 Ft Free Shipping

Product Description

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.

Eye Test Chart 20 Feet Kindergarten

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

Snellen Distance Vision Eye Chart 20Ft (Pack of 1) Free Shipping

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