Not only does the skin need sunscreen, but the eyes also need it! Our eyes are very fragile and easily stimulated and injured by the external environment. Especially the harm of ultraviolet rays in strong sunlight to the eyes cannot be ignored. Ultraviolet radiation is highly irritating. Ultraviolet radiation is an invisible electromagnetic wave that has strong penetration and bactericidal properties, but also has strong irritation and damage. There are three types of ultraviolet radiation: UVA, UVB, and UVC. Among them, UVA can penetrate clouds and glass to reach indoors, and can penetrate the skin to the dermis, causing sunburn; UVB can be partially absorbed by the ozone layer, but excessive exposure can cause skin sunburn; UVC can be absorbed by the atmosphere and rarely reaches the ground. What are the four major damages to the eyes when exposed to sunlight? If you neglect the sun protection of the eyes in summer, what harm will ultraviolet rays bring to the eyes? Keratitis cornea is the transparent tissue on the surface of the eyeball, which can protect the eyeball from external substances and also refract light into the eye. Ultraviolet rays can directly stimulate the cornea, causing necrosis and detachment of corneal epithelial cells, leading to electric ophthalmia (also known as "snow blindness"), which symptoms include redness, tearing, photophobia, blurred vision, and so on. Cataract refers to the opacity and opacity of the lens of the eye, which affects the passage of light and leads to decreased vision or even blindness. Ultraviolet radiation can promote the production of free radicals in the lens, leading to denaturation, oxidation, and aggregation of lens proteins, leading to the formation of cataracts. Although almost everyone experiences cataracts as they age, excessive exposure to ultraviolet radiation can accelerate this process. Macular degeneration is a small area in the center of the retina, and more than 90% of our visual information is provided by the macula. Ultraviolet rays can damage photoreceptor cells and pigment epithelial cells in the macular area, increasing the risk of macular degeneration. Eyelid cancer, also known as eyelid, is the skin tissue around the eyeball. It can protect the eyeball from substances such as dust and sweat, and is an important barrier around the eyes. Ultraviolet radiation can induce skin cancer in the eyelids, increasing the risk of developing eyelid cancer. The symptoms of eyelid cancer include abnormal lumps, ulcers, and pigmentation on the eyelid. Pay attention to these details when protecting your eyes from the sun. Avoid going out for long periods of time during the peak ultraviolet rays (11:00-14:00). If it is necessary to go out, try to choose a place with tree shade or try to exercise indoors. When going out, wear sunglasses with UV protection, especially in areas with strong reflected light such as water surfaces, beaches, and snow. Sunglasses should be produced by a reputable manufacturer with markings such as "UV resistant" and "UV400". Do not buy sunglasses without quality assurance. In addition, you can also wear a wide brimmed sunshade hat or use a sunshade umbrella to reduce direct ultraviolet radiation. Remember, even on cloudy or rainy days, the UV intensity may not be low, so you can refer to the local UV index before going out to more accurately protect yourself from the sun. Eat more foods that are beneficial to the eyes, such as foods rich in vitamins A, C, E, and carotenoids, such as carrots, spinach, tomatoes, citrus fruits, etc. These foods can enhance eye resistance and prevent eye damage