1. Genetic examination. 2, Histopathology. Degenerative myopia eye grows and enlarges, the lesions are mainly in the equatorial part, especially in the posterior pole, the sclera thins, and scleral staphyloma is formed in the posterior pole. The choroid is thinned, the stromal pigment is lost, the number of blood vessels is reduced, and small blood vessels and capillaries disappear.The Bruch’s membrane is thinned and may rupture. The ciliary body is markedly atrophied, mainly by hypoplasia of the circular muscle fibers. The choroidal retina was atrophic, and the RPE in the atrophic area completely disappeared. significant proliferation of the RPE formed Fuchs, which was covered with a layer of gelatinous cell-free exudate. 3, Fundus fluorescence angiography. In diffuse lesions of mild severity, the posterior pole of the arterial phase has a dotted or thread-like spot in the form of a lacquer crackle. With the prolongation of time and enhance the brightness, but not expand, after the disappearance of background fluorescence, after a long time, severe lesions with atrophic plaques at the posterior pole of the person, the contrast shows that the arterial phase has a wide range of dotted, threaded or lamellar fluorescent spots or is a strong fluorescent area and weak fluorescent area. It indicates atrophy of the choroidal capillary layer and visible filling of the thick choroidal vessels.