Researchers who have studied colour blindness and colour deficiency have found that:
A) total colour blindness is extremely rare in animal species.
B) total colour blindness in humans usually occurs when cones of the retina are absent or malfunctional.
C) blue-yellow colour blindness is the most common form of colour deficiency.
D) colour deficiency is more frequently found in women than in men.

Question

Quizplus · Accepted Answer

Total colour blindness in humans usually occurs when cones of the retina are absent or malfunctional. Option A is not true as total colour blindness is found in some animal species. Option C is partially true as blue-yellow colour blindness is a common form of colour deficiency. Option D is false as colour deficiency is more frequently found in men than in women.

Researchers Who Have Studied Colour Blindness and Colour Deficiency Have