Which vitamin is essential for vision?

Vitamin A is essential for vision because it plays a critical role in the formation of rhodopsin, a visual pigment found in the retina that allows the eyes to detect light. Specifically, Vitamin A is converted into retinal, which combines with a protein called opsin to form rhodopsin. This pigment is crucial for scotopic vision, which is the ability to see in low-light conditions. A deficiency in Vitamin A can lead to night blindness, as the eyes are unable to adapt to darkness effectively.

While other vitamins like C and E have important functions in maintaining overall eye health and may help protect against age-related eye diseases, they do not have a direct role in the biochemical processes of vision like Vitamin A. Vitamin K is primarily known for its role in blood coagulation and has no established role in vision. Therefore, Vitamin A stands out as the vitamin directly linked to the ability to see and process light.