Which statement about mal-nutrition-induced night blindness is most accurate?
a) the impaired vision is caused by reduced cone function.
b) vitamin supplements can reverse degenerative changes.
c) the most common cause is vitamin d deficiency.
d) visual pigment content is reduced in cones more than rods.

C) vitamin supplements can reverse degenerative changes

Explanation:

Vitamin A is required for the formation of light-sensitive pigments in photoreceptors of the retina. Prolonged vitamin A deficiency causes a much-reduced level of rhodopsin resulting in night blindness. Also called nyctalopia, night blindness is an inability to see well at low light levels. Some of the rich sources of vitamin A are cod liver oil, milk, broccoli, eggs, etc. However, taking supplements and eating vitamin A rich food in the diet can reverse the condition.

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