The vitamin that is essential for healthy vision is Vitamin A. This fat-soluble vitamin plays a crucial role in maintaining healthy eyesight, particularly in low-light conditions. Vitamin A is a key component of rhodopsin, a protein in the eyes that helps absorb light and enables vision in dim lighting. Additionally, it supports the health of the cornea and helps prevent eye-related issues such as night blindness and dry eyes. Foods rich in Vitamin A include carrots, sweet potatoes, spinach, and liver, making it important to incorporate these into a balanced diet for optimal eye health.