In addition, infrared rays do great harm to the eyes, and infrared rays with a wavelength exceeding 19000 angstrom are almost completely absorbed by the cornea, which will cause corneal burns (turbidity and white spots). Most of the energy of infrared ray with wavelength greater than 14000 angstrom is absorbed by cornea and intraocular fluid, but it cannot penetrate iris. Only infrared rays below 13000 angstrom can penetrate the iris, causing iris damage. Long-term exposure of human eyes to infrared rays may cause cataracts.
Infrared rays can also enhance the damage of ultraviolet rays to the skin and accelerate the process of skin aging. Using the same sunscreen products and the same ultraviolet intensity, the SPF value (sun protection coefficient) measured in outdoor natural sunlight is obviously lower than that measured in laboratory artificial light source, which is caused by the dual effects of ultraviolet rays and infrared rays on the skin under natural sunlight. Infrared rays and ultraviolet rays have the same effect in accelerating tissue degradation. Infrared rays can also promote the development of skin cancer caused by ultraviolet rays.
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Infrared pollution problem
Infrared is widely used in military, satellite, industry, health, scientific research and other fields, so it also produces infrared pollution problems. Infrared ray is a kind of thermal radiation, which will cause high temperature damage to human body. Strong infrared rays can cause skin damage, similar to scalding, burning pain first, then burning.
In several different situations, infrared rays can hurt the eyes. The infrared ray with the wavelength of 7500 ~ 13000 A has a high transmittance to the cornea, which can cause damage to the fundus retina. In particular, infrared rays of about 1 1000 angstrom can make anterior media (corneal lens, etc. ) eyes are not damaged and directly cause fundus retinal burns.
Infrared rays can be manufactured artificially, widely exist in nature, and are also produced during welding, which is harmful to the eyes of welders. Ordinary organisms radiate infrared rays, and the macro effect is heat.
Baidu Encyclopedia-Infrared