Choroidal atrophy in degenerative myopia

Degenerative myopia is also called pathologic myopia. Myopia can be divided into physiological myopia or simple myopia, and the diopter generally does not exceed -6D diopter, and progress is slow. It can be stable by the age of 20, and the fundus changes are mild. If the axial myopia is greater than -6D diopter, it is called highly myopia. The degree of myopia gradually deepens with age, and can reach 20 to 35 diopters. The literature reports up to 60 diopters. Degenerative myopia is different from general myopic ametropia. In addition to high myopia, it also has the following characteristics: ① abnormal visual function: visual acuity cannot be completely corrected, light sensitivity is reduced, dark adaptation is poor, visual field changes, and electrophysiological abnormalities. ② Accompanied by a series of complications: progressive extension of the anterior and posterior axis of the eyeball, enlargement of the posterior part of the eyeball, and choroidal retinal degeneration, including retinal atrophy after optic disc atrophy, pigmentation, focal choroidal atrophy, paint crack-like, Fuchs spot, vitreous degeneration, Detachment and choroidal neovascularization, followed by retinal detachment, cataracts and glaucoma. The affected eyes are often accompanied by degeneration of the fundus and visual impairment.

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