Difference in results of color vision Ishihara test done in congenital color blindness monocularly and binocularly?
Good morning Avadhesh
A quick review using Google Scholar reveals a substantial literature on the differences between experimental results using monocular and binocular vision and the Ishihara Test is particularly good at picking up such differences.
Clearly it is very easy to cause differential adaptation in either or both of the monocular chromatic and luminance responses in such experiments. Your Ishihara Test differences could for example be due to a temporally local adaptation in one or other of the visually opponent R- G responses of colour vision.
In case of congenital cause of Color blindness will be no difference between monocular or binoculat testing
No difference in monocular or binocular color vision score is expected in congenital color blindness.
It is important to distinguish between color deficiency, as tested with Ishihara plates, and color blindness, aka achromatopsia, where there is no perception of colors. In both conditions, I would not expect any difference in testing between monocular and binocular tests.
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