Eat Right Practice Exam

Which nutrient is essential for maintaining healthy vision?

1. Vitamin C

2. Vitamin D

3. Vitamin A

4. Vitamin B12

The correct answer is: Vitamin A

Vitamin A is crucial for maintaining healthy vision due to its role in the formation of rhodopsin, a protein in the eyes that allows us to see in low light conditions. This nutrient is a component of pigments in the retina, specifically in the rod cells, which are responsible for vision in dim light. Additionally, Vitamin A supports overall eye health by contributing to the integrity of the cornea and preventing night blindness, which can occur as a result of Vitamin A deficiency. While Vitamin C, Vitamin D, and Vitamin B12 have important roles in overall health, they do not directly influence vision in the same way that Vitamin A does. Vitamin C acts as an antioxidant and plays a role in eye health, but it does not specifically maintain vision-related functions. Vitamin D is essential for bone health and immune function, and Vitamin B12 is vital for red blood cell formation and neurological functions, but none of them are as directly linked to vision maintenance as Vitamin A.