Price: $24.50
(as of Mar 15, 2022 23:27:45 UTC – Details)
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. This became the "Standard Vision" measurement. Also, Snellen developed the idea of a 5 x 5 grid for a standard for his optotypes. Each Optotype must meet certain percentage requirements in this grid before it is used for testing. This helps to make a uniform and equal vision chart. The Snellen eye test is the basic many other vision tests.
Is Discontinued By Manufacturer : No
Parcel Dimensions : 55.88 x 27.94 x 0.25 cm; 113.39 Grams
Date First Available : Oct. 20 2014
Manufacturer : KASHSURG
ASIN : B00OOJOFF4
Manufacturer reference : DP-4407
Eye Chart measures 22 x 11 in.
Plastic Washable Sheet.
Wall Hanging Whole for easy hanging.
