For good vision. Vitamin A is fat soluble, and is found in foods such as apricots, carrots, spinach, tomatoes, and in eggs, milk and liver. It is essential for the healthy functioning of the retina of the eye, making it important for good vision. Vitamin A is also responsible for the synthesis of rhodopsin, a compound that enables us to have night vision, and the appearance of night blindness is a warning of a deficiency of this vitamin.