Which of the following vitamins is essential for normal vision ?

Retinol, also known as Vitamin A, is essential for maintaining normal vision. It is a critical component of rhodopsin, a light-sensitive protein found in the rod cells of the retina that allows the eye to see in low-light conditions (scotopic vision). Vitamin A also plays a vital role in maintaining a clear cornea, which is the protective outer layer of the eye.

• Deficiency: A deficiency in Vitamin A is the leading cause of preventable blindness in children and typically manifests first as night blindness (nyctalopia).
• Other Options: Folic acid (B₉) is crucial for DNA synthesis and red blood cell formation. Riboflavin (B₂) and Niacin (B₃) are primarily involved in energy metabolism and cellular respiration.