Which vitamin is primarily associated with promoting healthy vision?

Vitamin A is primarily associated with promoting healthy vision due to its crucial role in the functioning of the retina. It is a key component of rhodopsin, a protein in the retina that enables vision in low-light conditions. A deficiency in vitamin A can lead to conditions such as night blindness and can ultimately cause more severe vision problems if left unchecked.

In addition to its function in vision, vitamin A is essential for overall eye health, supporting the maintenance of the cornea and conjunctival membranes. It also plays a role in the production of tears, which are vital for keeping the eyes moist.

While other vitamins like B, C, and D have their own health benefits, they do not have a direct and significant impact on vision as vitamin A does. Vitamin C is important for the health of blood vessels in the eyes, and vitamin D plays a role in reducing the risk of certain eye diseases, but neither is primarily associated with promoting vision in the same way that vitamin A is.