Lutein is a naturally-occurring carotenoid that is abundant in fruits and vegetables (especially dark, leafy green ones) and egg yolks, and it is highly concentrated in the macula of the eye, with smaller amounts found in the retina, lens, and optic nerve. Together with other high-potency antioxidants, lutein helps block out visible blue light, one of the major causes of light-induced damage to the eyes.

This powerful carotenoid also helps ward off vision loss—and more specifically helps to prevent macular degeneration—by increasing the thickness of the macula. 

Research has also shown that lutein can lower risk of cataracts. 

Other benefits of lutein include:

* Helping to reduce eye fatigue and glare sensitivity
* Promoting normal visual function and proper lens density
* Strengthening eye tissue
* Supporting visual acuity