Complete color blindness results in a perception of the world only in black and white and is a result of
A) cones that are missing or function abnormally.
B) rods that fail to function under higher levels of illumination.
C) excessive pigmentation of the cornea.
D) a lens that has lost its elasticity and can no longer focus the image appropriately on the retina.

Question

Quizplus · Accepted Answer

Complete color blindness, also known as achromatopsia, is caused by a lack or abnormality in the function of all three types of cones (red, green, and blue) in the retina. Therefore, option A is the correct answer as it mentions cones that are missing or function abnormally. Options B, C, and D do not relate to the cause of complete color blindness.

Complete Color Blindness Results in a Perception of the World