Ultraviolet light refers to solar rays with wavelengths between 200 nm and 400 nm and includes three types: UVA, UVB, and UVC. Ultraviolet rays account for approximately 13% of the sun's rays (290 nm to 2000 nm) reaching the Earth's surface. UVA accounts for 97%, UVB accounts for 3%, and UVC approaches 0.
The damage of ultraviolet rays to the human eye mainly depends on the wavelength of ultraviolet radiation, radiation time and radiation intensity, and the strength of the human eye's own defense mechanism.
The cornea and the lens are the eye tissues that are most often damaged by ultraviolet rays.
Solar keratitis and corneal endothelium damage and solar cataract are the most relevant ocular diseases.
And there are two prominent features of UV damage:
1, UV damage can accumulate. Since ultraviolet light is invisible light, it is difficult for people to intuitively feel.
2, UV damage to the eyes is irreversible, that is irreparable. For example: cataract surgery can only be replaced by an artificial lens. Prolonged exposure of the eyes to the eye can lead to damage to the cornea and retina. The lens is cloudy until it triggers a cataract, resulting in permanent vision damage.
Because ultraviolet radiation is invisible to the eyes, it is not immediately obvious. If you do not wear glasses, you do not feel particularly uncomfortable. It just means that your eyes are not very sensitive to visible light (such as glare, glare, or reflected light). , and can not avoid ultraviolet damage. Therefore, in order to protect the eyes when in the outdoors should wear a quality assurance, the lens can be 100% UV protection glasses.
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