Cold Sores & Fever Blisters. What Causes Cold Sores and Fever Blisters? Both cold sore and fever blister refer to the lip blisters caused by infections of the Herpes Simplex I virus (not to be confused with Herpes Simplex II, which is generally associated with genital herpes). Cold Sores are viral infections which cause recurrent groups of irritating, even painful blisters on the lips.
Lutein and zeaxanthin protect your eyes from harmful high-energy light waves like ultraviolet rays in sunlight. Studies suggest that a high level of both in eye tissue is linked with better vision, especially in dim light or where glare is a problem. Diets rich in these two nutrients may help hold off age-related eye diseases.
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.esearch has also shown that lutein can lower risk of cataracts. For example, one study found that older women who had the highest levels of lutein (and zeaxanthin, another nutrient that is critical for vision health) were about a third less likely to have cataracts.