The development of eyes from myopia to high myopia can be divided into three stages.
Stage one: pseudomyopia
Pseudomyopia generally refers to the change of diopter caused by the spasm of ciliary muscle in the eye caused by visual fatigue. The difference between pseudomyopia and true myopia is that the degree of pseudomyopia can be reduced after mydriasis, but true myopia can not.
If it is pseudomyopia, after a period of rest or relaxation of ciliary muscles, vision is likely to recover part of. Therefore, parents found that the children’s vision decreased, do not wear glasses blindly, should first through medical optometry, distinguish between true and false myopia.
We should not take it lightly to find pseudomyopia. If we don’t pay attention to rest and eye use habits, pseudomyopia may develop into real myopia within 3 months to 6 months. Therefore, if you are diagnosed with pseudomyopia, you must pay attention to develop good habits of using eyes. If you use your eyes for 45 minutes, you should stop to rest for 5-10 minutes and have a distant view and relaxation.
The second stage: true myopia
Academically, true myopia is also known as axial myopia. The main reason for this stage is the axial growth. So, how does the axial axis grow?
If the child continues to overuse the eye at close range for a long time under the condition of pseudomyopia, the ciliary muscle will be further tired, and the adjustment ability will continue to decline. Due to the excessive adjustment, the radial effect will be strengthened, so that the extraocular muscles exert pressure on the eyeball, the intraocular pressure will increase, and the intraocular tissue will be congested. In addition, the youth’s eyeball tissue will be tender, and the pressure on the eyeball wall will gradually extend to the front of the eyeball The length of the posterior axis exceeds the normal value, forming axial myopia.
According to the analysis of experts, the degree of myopia increases by 300 degrees for every 1 mm increase in the axial length of myopia. Generally, the myopia below 300 degrees is called low myopia, 300 to 600 degrees is called moderate myopia, and those above 600 degrees are called high myopia.
The third stage: high myopia
With the growth of the ocular axis, the size of the eyeball is also expanding. In the process of eyeball enlargement, the sclera and choroid are also growing according to the internal signal requirements of the eye, but the retina can not grow with it. In order to fit the enlarged sclera and choroid, there will be many tears or lattice degeneration in the periphery of the retina, which will cause early pathological changes for retinal detachment in the future.
In addition, due to the lengthening of the ocular axis, retinal thinning, blood supply disorders, malnutrition and tissue degeneration, vitreous liquefaction, vitreous opacity, posterior vitreous detachment, etc. It can be seen that once high myopia occurs, there will be a lot of risk.
They should develop good habits of using eyes, strengthen their health awareness, pay attention to their own eyesight, and control the growth of degree,