Elaborate the role of vitamin A in visual perception. What are the factors which affects the bioavailability of vitamin A?

Vitamin A plays a crucial role in visual perception, particularly in maintaining healthy vision and supporting low-light and color vision. It is essential for the functioning of the retina, a light-sensitive tissue located at the back of the eye. The primary form of vitamin A involved in visual perception is called retinal, which combines with proteins to form rhodopsin, a molecule that enables the retina to detect light and send visual signals to the brain.

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