Role of Vitamin A in the visual cycle. 

Role of Vitamin A in the visual cycle:--

• Vitamin A, is a well known fat soluble vitamin found in many supplements and foods.
• As it relates to eyesight, vitamin A (also called all-trans-retinol) has been shown to be useful in helping with night vision.
• Vitamin A is a precursor of rhodopsin, the photopigment found in rods within the retina of our eye that helps us to see at night.  Without vitamin A, "night blindness" occurs.
• As with any medication or supplement, excessive doses or unnecessary exposure can be harmful.  Therefore, doses above the UL should be avoided because Vitamin A has been associated with an increase risk for hip fracture in postmenopausal women, lung cancer, cardiovascular mortality and total mortality.

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