Defective color vision and its inheritance.

Defective color vision and its inheritance.

We owe the first accurate description of color blindness to the chemist John Dalton, who in 1798 characterized his own condition in the words 'persons in general distinguish six kinds of colour in the solar image; namely, red, orange, yellow, green, blue, and purple.... To me it is quite otherwise:-I see only two, or at most three, distinctions. These I should call yellow and blue; or yellow, b...

Diagnostic Tests of Color Defective Vision

The genetics of normal and defective color vision

The contributions of genetics research to the science of normal and defective color vision over the previous few decades are reviewed emphasizing the developments in the 25years since the last anniversary issue of Vision Research. Understanding of the biology underlying color vision has been vaulted forward through the application of the tools of molecular genetics. For all their complexity, th...

Flicker photometry with chromatic adaptation and defective color vision.

When we alternate red and green stimuli at a certain frequency, we observe a flicker­ ing field. By adjusting luminances of both stimuli, we can minimize the flicker percep­ tion. This is the principle of the flicker pho­ tometry. When we apply the method to color defects, both subjects who are protanomal and those who are protanopic show a defi­ nitely different adjustment of two lumi­ nances ...

Measurement of Color Defective and Normal Color Vision Subjects’ Color and Luminance Contrast Threshold Functions on Crt

To perform a more complete diagnosis on the effect of color vision deficiency on visual performance we measured luminance and color contrast threshold functions. Measurements were carried out on CRT for a range of spatial frequencies on color deficient and normal color vision individuals. Luminance and color contrast threshold is a measure of the recognition limits of low luminance and color co...