The ocular wall is mainly divided into outer layer, middle layer and inner layer. The outer layer consists of cornea and sclera, also known as fibrous layer. Because the cornea is transparent, there are no blood vessels on it. Therefore, the cornea mainly gets nutrition from tears. If the nutrients contained in tears are insufficient, the cornea will become dry and the transparency will decrease.
Intraocular: including anterior chamber, posterior chamber and vitreous cavity. Ocular contents include aqueous humor, lens and vitreous body. All three are transparent and are called refractive media together with cornea. Aqueous humor is produced by ciliary process, which nourishes cornea, lens and vitreous body and maintains intraocular pressure. The lens is an elastic transparent body shaped like a biconvex lens, which is located behind the iris and pupil and in front of the vitreous body.
Extended data
Ways to protect your eyes
1, pay attention to the working environment.
The light in the computer room should be suitable, neither too bright nor too dark, so as to avoid interference caused by direct light irradiation on the fluorescent screen. Regularly remove indoor dust and microorganisms. When cleaning, it is best to disinfect the air filter with a wet cloth or a warm mop, adjust the air volume reasonably, and change the fresh air.
2. Pay attention to the combination of work and rest
Generally speaking, computer operators should rest for about 1 0 minutes after continuous work. Moreover, it is best to exercise hands and feet and trunk outside the operating room, take a walk, do radio exercises, take the initiative to rest, or do eye exercises and exercise your head indoors.
Pay attention to protect your eyesight
To protect your eyesight, besides taking regular rest and paying attention to supplementing foods rich in vitamin A, you'd better pay attention to the distance and do eye exercises regularly to ensure adequate sleep time.
4, pay attention to keep the skin clean
Keep the skin of face and hands clean, because there is a lot of static electricity on the surface of computer screen, and the accumulated dust can be transferred to the exposed skin of operator's face and hands. If you don't pay attention to cleaning for a long time, it will easily lead to ugly macula and pigmentation, and even cause skin lesions in severe cases, affecting beauty and physical and mental health.
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People's Network -7 preventive measures are the most effective for protecting eyes.