Carotenoids

Carotenoids represent one of the most widespread groups of naturally occurring pigments. These compounds are largely responsible for the red, yellow, and orange color of fruits and vegetables, and are also found in many dark green vegetables. The sole known role of carotenoids is to act as a source of vitamin A in the diet.

Vitamin A actually is a group of antioxidant compounds that play an important role in vision, bone growth and health of the immune system. Vitamin A also helps the surface of the eye, mucous membranes and skin be effective barriers to bacteria and viruses, reducing the risk of eye infections.

Vitamin A obtained from colorful fruits and vegetables is in the form of "provitamin A" carotenoid, which are converted to retinol by the body after the food is ingested. Good food sources of provitamin A carotenoid include carrots, sweet potatoes, spinach, kale and cantaloupes.

Because vitamin A helps protect the surface of the eye, it is essential for good vision.Studies show vitamin A eye drops are effective for the treatment of dry eyes.