Lutein is an important antioxidant, a member of the carotenoid family (a group of natural fat-soluble pigments found in plants), also known as “phytoalexin”, which exists in nature together with zeaxanthin. 1, the main pigment component of the retina: lutein and zeaxanthin constitute the main components of plant pigments in vegetables, fruits and flowers, and are also the main pigments in the macular region of the human retina. The human eye contains high amounts of lutein, an element that the human body cannot manufacture and must be supplemented by the intake of lutein; if it is lacking, the eye will go blind. 2, protect the eyes from light damage, slow down the aging of the eyes and prevent lesions: UV and blue light in sunlight entering the eyes will produce a large number of free radicals, leading to cataracts, macular degeneration, and even cancer. UV rays are generally filtered out by the cornea and lens, but blue light can penetrate the eye directly to the retina and macula, while lutein in the macula can filter out blue light and avoid damage to the eye from blue light. The fatty outer layer of the macula is particularly vulnerable to oxidative damage from sunlight, so this area is highly susceptible to degeneration. It is found in high levels in fresh green vegetables and citrus fruits. Lutein cannot be synthesized by the body itself and must be absorbed by food. It is mainly found in dark green fruits and vegetables, such as: kale, spinach, green cauliflower, cilantro, pumpkin, peas, mustard, corn, kiwi, grapes, oranges, etc. Each person needs about 6 mg of lutein a day, and the amount needed varies according to the length of time spent using the eyes, whether the habits are good and whether the damage factor is serious. In addition, egg yolks contain carotenoids, lutein, zeaxanthin and other antioxidants that can help slow down the aging of the eyes. Studies have shown that insisting on eating an egg every day for as little as five weeks can have an effect, and eggs with dark yolks contain more lutein and zeaxanthin for better eye protection.