Causes of 200 degree myopia

summary

Myopia is a symptom that the eyes can't see far objects clearly, but can see near objects clearly. Under the premise of static refraction, distant objects can not converge in the retina, but form a focus in front of the retina, resulting in visual deformation and blurring of distant objects. Myopia is divided into refractive and axial. Among them, refractive myopia is the most serious. Here are the reasons for 200 degree myopia.

Causes of 200 degree myopia

First, most of the causes of myopia are too long anterior and posterior axis (called axial myopia), followed by strong refractive power (called refractive myopia). Myopia mostly occurs in adolescence, genetic factors have a certain impact, but its occurrence and development are closely related to inadequate lighting, improper reading posture, long-term close work, etc. Oh, the form of use of home optometry, can alleviate visual fatigue, restore pseudomyopia.

Second: most of myopia occurs in adolescents, and the degree of myopia deepens year by year in the growth stage, and does not develop or develops slowly after maturity. The degree of myopia rarely exceeds 6D, the fundus does not have degenerative changes, and the vision can be corrected with glasses, which is called simple myopia. Another kind of myopia occurs earlier (between 5 and 10 years old), and progresses very fast. It continues to develop after 25 years old. The degree of myopia can reach more than 15d, often accompanied by fundus changes, and the vision is not easy to correct. It is called degenerative myopia. In addition, it is customary to call myopia below 3D as mild myopia, 3-6d as moderate myopia, and more than 6D as high myopia.

Third: the eye is a sensitive organ of human body to electromagnetic radiation. Excessive electromagnetic radiation pollution will affect the visual system, mainly manifested as eye fatigue, dryness, decreased vision, and some can cause cataract, glaucoma, etc., which is closely related to the frequent beating of TV images and the reduction of blinking times caused by people's high concentration when watching TV . When people watch TV pictures, the blinking times of the eyes will be reduced invisibly, thus reducing the secretion of lubricant and tears in the eyes. At the same time, the eyeball is exposed to the air for a long time, which makes the water evaporate too fast, causing dry and tired eyes, and even damaging the cornea.

matters needing attention

The electromagnetic wave of TV can also stimulate the eyes, causing dry eyes, fatigue, ghosting, blurred vision and even head and neck pain. Some people have done experiments, watching TV for 4 to 5 hours in a row, the vision will be temporarily reduced by 30%, after a period of time to recover. If you watch TV continuously for a long time, your eyesight will not recover, which will lead to a long-term decline in eyesight. Especially when you look at LCD or color TV, although the radiation is small, but because the brightness is too high, it is easier to make the eyes tired and the eyesight declines faster.