BD 9.610

Description

Demonstration plates: (plate number one, typically the numeral "12"); designed to be visible by all persons, whether normal or color vision deficient. For demonstration purposes only, and usually not considered in making a score for screening purposes..
Transformation plates: individuals with color vision defect should see a different figure from individuals with normal color vision..
Vanishing plates: only individuals with normal color vision could recognize the figure..
Hidden digit plates: only individuals with color vision defect could recognize the figure..
Diagnostic plates: intended to determine the type of color vision defect (protanopia or deuteranopia) and the severity of it..

The test consists of a number of Ishihara plates, which are a type of pseudoisochromatic plate. Each plate depicts a solid circle of colored dots appearing randomized in color and size.[3] Within the pattern are dots which form a number or shape clearly visible to those with normal color vision, and invisible, or difficult to see, to those with a red-green color vision defect. Other plates are intentionally designed to reveal numbers only to those with a red-green color vision deficiency, and be invisible to those with normal red-green color vision. The full test consists of 38 plates, but the existence of a severe deficiency is usually apparent after only a few plates. There are also Ishihara tests consisting of 10, 14 or 24 test plates, and plates in some versions ask the viewer to trace a line rather than read a number.

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KASHSURG 38 Plates with User Manual Ishihara Test Chart Books for Color Deficiency -Pack of two books

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