Abstract: when the axis of myopia increases, the vitreous body will not increase, so the vitreous body can not fill all the space in the eye, resulting in condensation and liquefaction. The condensed part has high density and can have flocculent, filiform, colorless and transparent turbidity.
high myopia is the sixth blindness disease in China, second only to cataract, glaucoma, macular disease and other eye diseases. According to statistics, there are more than 280000 patients with blindness caused by high myopia and eye diseases in China.
according to the latest survey by the Ministry of education and the Ministry of health, among the 400 million myopic patients in China, high myopia accounts for 15% of the myopic population, and the proportion of teenagers is as high as 67.5%, which increases at a rate of 8% every year. Among the young people, The myopia rate has shown a pattern of “the older the more common, the younger the age, the faster the growth rate”.
why do teenagers with high myopia show a rapid increasing trend of younger age? On the one hand, nowadays, there are more and more electronic products. Teenagers playing with mobile phones, iPads and other electronic products for a long time are easy to cause eye fatigue. On the other hand, teenagers have heavy learning and less outdoor activities, which is prone to myopia. Therefore, there are only two steps from myopia to blindness, that is, when myopia develops to high myopia, the probability of blindness is greatly improved.
high myopia causes retinal detachment and blindness
, which is the main complication of high myopia. Due to the axial elongation and intraocular dystrophy of myopia, the peripheral part of the retina often suffers from retinoid degeneration and lattice degeneration. The retina in the degeneration area is very thin and is prone to perforation. Some have been perforated to form holes. In addition, vitreous liquefaction and increased mobility lead to detachment of the traction retina. Among the patients with retinal detachment, 70% are myopia.
high myopia complicated with macular and other diseases causes blindness
high myopia is easy to be complicated with macular disease, retinal detachment, retinal hemorrhage, blindness caused by holes, macular hemorrhage and macular degeneration, myopia has poor eye blood supply, retinal blood shortage, and the retina produces a kind of neovascular growth factor, which promotes the growth of subretinal neovascularization, The walls of these new blood vessels are extremely thin. Easy to rupture and bleed, and form macular hemorrhage after bleeding. After the bleeding is absorbed, the new blood vessels can rupture again and bleed again. After multiple bleeding, local scars are formed, causing macular degeneration, thus permanently damaging vision.
high myopia complicated with vitreous liquefaction causes blindness
when the axis of myopia increases, the vitreous will not increase again, so the vitreous can not fill all the space in the eye, resulting in condensation and liquefaction. The condensed part has high density and can have flocculent, filiform, colorless and transparent turbidity. The vitreous structure in the liquefied part disintegrates, forming a gap filled with liquid, increasing the vitreous activity, pulling the retina to separate, causing the dark shadow in front of the eyes, resulting in blindness.
high myopia causes cataract blindness
cataract myopia has abnormal intraocular nutrition metabolism, which changes the membrane permeability of the lens, gradually produces turbidity due to lens nutritional disorder and metabolic disorder, and gradually decreases vision, resulting in concurrent cataract. This kind of cataract develops slowly, mainly core opacity and posterior membrane opacity.