Carotenoids are a group of pigments found mainly in green leafy vegetables and colored fruits, and are deposited selectively in different tissues. Lutein and zeaxanthin, found in kale and spinach, are deposited in the retina while others like lycopene, for example, found in tomatoes, is concentrated in the prostate.
After reviewing the various studies, the authors concluded that the pigments lutein and zeaxanthin do have an effect on visual performance. In particular, they are associated with reducing glare, enhancing contrast, as well as improving light absorption and increasing the visual range. Simply put, these nutrients improve vision.
The lead author noted that the research of the effects of lutein and zeazanthin are important because "it is clear that they could potentially improve vision through biological means. For example, a study conducted in 2008 suggests that the pigments protect the retina and lens and perhaps even help prevent age-related eye diseases such as macular degeneration and cataract."
lutein is a yellow or orange pigment found in some fruits and vegetables, including carrots, squash and other orange and yellow fruits and vegetables, as well as green leafy vegetables, such as spinach.
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