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Snellen Plastic Eye Chart 20 Feet 22 x 11inches

Snellen Plastic Eye Chart 20 Feet 22 x 11inches
- 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
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.
Country USA
Brand Visionären
Manufacturer KASHSURG PROFESSIONAL MEDICAL PRODUCTS
Binding Unknown Binding
ItemPartNumber EFP-4407
Model EFP-4407
UnitCount 1
ReleaseDate 0000-00-00

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