Ametropia will “fail to see” teenagers are mostly mixed myopia

Abstract: [progressive myopia] is high myopia, also known as pathological myopia. Its diopter is more than 600 degrees, up to 4000 degrees. Generally, it occurs earlier, the axial diameter of the eyeball continues to lengthen, and a series of pathological changes can occur in many tissues of the eyeball.

Myopia refers to the parallel light from infinite distance. After passing through the refractive system of the eye, it gathers into a focus in front of the retina, and forms an unclear image on the retina. There are three main causes of

and

myopia, including axial myopia, refractive myopia and curvature myopia.

myopia has many classification methods:

1 According to the clinicopathological classification,

[simple myopia] that is, general myopia. Medium and low myopia with diopter below 600 degrees usually develops slowly. The ocular tissue is normal without pathological changes.

[progressive myopia] that is, high myopia, also known as pathological myopia. Its diopter is more than 600 degrees, up to 4000 degrees. Generally, it occurs early, the axial diameter of the eyeball continues to lengthen, and a series of pathological changes can occur in many tissues of the eyeball.

2. Classified by regulatory function,

[pseudomyopia] also known as accommodative myopia. The axial diameter of the eye is normal, but the refractive power of the refractive stroma exceeds the normal degree, which is generally due to excessive lens adjustment. Therefore, the distant light enters the eye and is imaged in front of the retina. After mydriasis, the refractive power of myopia disappears completely, which is manifested as orthoopia or hyperopia.

[true myopia] also known as axial myopia, it has normal refractive power of refractive stroma, prolonged anterior posterior diameter of ocular axis, and distant light is imaged in front of retina after entering the eye.

[mixed myopia] a condition in which true and false myopia exist at the same time. After mydriasis, myopia diopter is much lower, but it is still myopia. Juvenile myopia students are mostly in this myopia state in the process of heavy learning tasks and physical development.

myopia is characterized by reduced far vision and near vision (in some cases) Normal; Continuous blurred vision, squinting, visual fatigue, short working distance, may be accompanied by exophoria, exotropia or exophthalmos. High myopia can cause fundus degenerative changes of varying degrees, such as myopic arc spots and leopard shaped fundus.