Which vitamin plays a crucial role in maintaining healthy vision?

Vitamin A is essential for maintaining healthy vision because it is a key component of the visual cycle in the retina. It is converted into retinal, a form that is necessary for the synthesis of rhodopsin, a light-sensitive pigment found in rod cells of the retina. Rod cells are responsible for vision in low-light conditions, and a deficiency in vitamin A can lead to night blindness, demonstrating its critical role in vision. Additionally, vitamin A contributes to the health of the cornea and other parts of the eye, thereby supporting overall ocular health. This vitamin's involvement in the formation of visual pigments underscores why it is vital for maintaining optimal vision.