Why are vitamin $A$ and vitamin $C$ essential to us? Give their important sources.

(N/A) Vitamin $A$ is essential for maintaining healthy vision and skin. Its deficiency leads to xerophthalmia (hardening of the cornea of the eye) and night blindness.
Vitamin $C$ is essential for the synthesis of collagen and maintaining healthy connective tissues. Its deficiency leads to scurvy (bleeding gums).
The important sources of vitamin $A$ are fish liver oil,carrots,butter,and milk.
The important sources of vitamin $C$ are citrus fruits,amla,and green leafy vegetables.