Which vitamin is crucial for maintaining healthy eyesight?

Vitamin A is crucial for maintaining healthy eyesight due to its integral role in the functioning of the visual system. It is a key component of rhodopsin, a protein in the retina that enables vision in low light conditions. Additionally, vitamin A supports the health of the cornea and helps prevent conditions that can lead to vision problems, such as night blindness. This vitamin also plays a role in the maintenance of the conjunctival membranes and cornea, contributing to overall eye health. While the other vitamins listed have important functions in the body, none are as directly linked to eyesight as vitamin A.