Snellen Plastic Eye Chart 20 Feet 22 x 11inches


Snellen Plastic Eye Chart 20 Feet 22 x 11inches by Visionären at A to Z Medicine. MPN: EFP-4407. Hurry! Limited time offer. Offer valid only while supplies last. The Snellen eye chart was originally introduced in 1862 by Herman Snellen. The Snellen eye test uses the idea of a subtended 5 minutes of arc with a 20 foot distance. This became the ''standard vision'' measurement. Also, Snellen developed the idea of a 5x5 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 chart is the basis for many other


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Snellen Plastic Eye Chart 20 Feet 22 x 11inches by Visionären (Image #1)
4.6 out of 5 stars with 108 reviews
Condition: New
Availability: In Stock
$15.00


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Product Description & Reviews

The Snellen eye chart was originally introduced in 1862 by Herman Snellen. The Snellen eye test uses the idea of a subtended 5 minutes of arc with a 20 foot distance. This became the "standard vision" measurement. Also, Snellen developed the idea of a 5x5 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 chart is the basis for many other vision tests.

Features & Highlights

  • Snellen Eye Chart
  • 20 Feet Distance Vision Eye Chart.
  • Chart with Red Green Lines
  • Snellen Wall Eye Chart, 22 in. x 11 in.
  • Washable Eye Chart

Additional Information

Brand:
Visionären
Manufacturer:
Kashsurg
Category:
Eye Charts
MPN:
EFP-4407
Part Number:
EFP-4407
Publisher:
Kashsurg
Binding:
Health and Beauty
Item Weight:
0.07 pounds
Package Weight:
0.05 pounds
Package Size:
11.2 x 0.2 x 22 inches

 


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