The deepening of myopia has been troubling many teenagers year by year, and also formed a phenomenon: as long as you wear glasses, the degree of myopia will continue to deepen, and gradually develop to high myopia.
What has happened to our fundus? What is the reason for our fundus changes, step by step to develop to high myopia?
The development of high myopia can be divided into three stages
Stage of pseudomyopia
At this stage, the decrease of accommodation ability of ciliary muscle spasm plays a role When we look close, our ciliary muscles are tense, which is equivalent to lifting objects with one hand. If we concentrate on using our eyes closely for a continuous period of time, it is likely to cause ciliary spasm. For example, if we don’t pay attention to rest, we will have temporary visual loss,
The main reason for this stage of myopia is the temporary spasm of ciliary muscles, which can be recovered by adequate rest and eye movement. However, if the eye habits continue before, it will develop to the second stage: true myopia
True myopia stage
Academically, true myopia is also known as axial myopia. The main reason for this stage is the growth of our axial axis. How does the axial length grow? If the eye is over used for a long time, 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, which will make 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, the eyeball wall will be compressed gradually, and the anterior and posterior axes of the eyeball will become longer than the normal value myopic eye.
The axial length of patients with true myopia is significantly longer than before. According to the analysis of experts, the myopia degree increases by 300 degrees for every 1 mm increase of axial length in myopic patients. Generally, the myopia below 300 degrees is called low myopia, those with 300 to 600 degrees are called moderate myopia, and those above 600 degrees are called high myopia.
With the increase of the axial length of the eye, the eyeball expands continuously, which is much larger than that of the normal eyeball. In the process of eyeball enlargement, the sclera and choroid can grow continuously 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, high myopia general intraocular pressure will be slightly higher, if you do not pay attention to the eye, it is likely to appear glaucoma. Complications of high myopia are also potential risks due to changes in the fundus, such as cataract, glaucoma, floater’s disease, posterior scleral staphyloma, retinal degeneration, hemorrhage, holes and detachment, etc.