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Ishihara Test Chart Books for Color Deficiency 38 Plates 2021 Edition with User Manual and One Eye Occluder in Box
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Ishihara Test Chart Books for Color Deficiency 38 Features
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Vanishing design: Only people with good color vision can see the sign. If you are colorblind you won’t see anything.
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Transformation design: Color blind people will see a different sign than people with no color vision handicap.
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Hidden digit design: Only colorblind people are able to spot the sign. If you have perfect color vision, you won’t be able to see it.
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Classification design: This is used to differentiate between red- and green-blind persons. The vanishing design is used on either side of the plate, one side for deutan defects an the other for protans.
About Ishihara Test Chart Books For Color Deficiency 38
Dr Shinobu Ishihara introduced in 1917—almost 100 years ago—the most well known color blindness test. Each of his tests consists of a set of colored dotted plates, each of them showing either a number or a path. Since then this is the most widely used color vision deficiency test and still used by most optometrists and ophthalmologists all around the world. There are other color blindness tests available, but none of them is as famous as the Ishihara plates. It is also well known, that even people with normal color vision sometimes struggle with this test. But nevertheless this plates are still in use in the absence of any better and still affordable color vision test.
