Question

What problems, in terms of wavelength sensitivity, explain colour blindness?

Stereoscopic vision is necessary to tell whether a body is rotating or just changing shape.

a. Explain why the right eye needs the input from the left eye to distinguish between the different paths from A to A1- A2.

Answer 1

The spectral sensitivities of the cones differ; one is most sensitive to short wavelengths, one to medium wavelengths, and the third to medium-to-long wavelengths within the visible spectrum, with their peak sensitivities in the blue, green, and yellow-green regions of the spectrum, respectively. Color blindness is a genetic condition that only rarely occurs in women. Color blindness occurs when one or more types of cones are either totally absent or have limited spectral sensitivity. By far the most common is congenital (hereditary) red-green color blindness, meaning the L-cones and/or M-cones are either damaged or absent. The different kinds of inherited color blindness result from partial or complete loss of function of one or more of the three different cone systems. When one cone system is compromised, dichromacy results. The most frequent forms of human color blindness result from problems with either the middle (green) or long (red) wavelength sensitive cone systems, and make it hard to discriminate reds, yellows, and greens from one another.