Select the letter of the choice that best completes the statement. A vitamin needed to prevent night blindness isa. vitamin A.b. vitamin K.c. vitamin C.d. vitamin D.
Select the letter of the choice that best completes the statement. A vitamin needed to prevent night blindness is
a. vitamin A.
b. vitamin K.
c. vitamin C.
d. vitamin D.
Vitamins are an essential micronutrient that needs to be included in smaller diet quantities to maintain the body's proper metabolism. There are 13 vitamins in nature that are divided based on their solubility and action. Thus vitamins are distributed in two categories; Fat/lipid-soluble vitamins and Water-soluble vitamins.
Night blindness is commonly called Nyctalopia, is a medical condition in which the eyes are unable to detect and focus on objects in low light. As the name suggests, the person can adapt to objects at night, but he/she can not focus on objects in the dark. Night blindness is a vision impairment caused by near-sightedness, cataracts, retinitis pigmentosa, usher syndrome, etc.
A significant cause of night blindness is a deficiency of vitamin A. Vitamin A is a type of Fat/Lipid soluble retinoid that is essential for the functioning of various body activities. Vitamin A helps in strengthening the immune system, reproduction, vision, and cellular communication. Vitamin A is a critical factor involved in vision and photoreception. It consists of a vital element called rhodopsin, a protein present in the retinal receptors that absorb light. It also facilitates normal differentiation and functioning of conjunctival membranes and the cornea.
Thus, option 'a' is the correct answer.
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