Myopia greater than -6.00D (-600 degrees) is clinically called high myopia. The clinical manifestations are: (1) Rapid myopia development: High myopia often develops rapidly at an early age, with another developmental peak in adolescence (15-20 years old); unlike simple myopia, the development of myopia does not stop even in adulthood, so it is also called progressive myopia. (2) Protrusion of the eye: The anterior and posterior diameters of the eye grow significantly in highly myopic eyes, some form post-scleral staphyloma, the anterior chamber deepens, the ciliary muscle atrophies, and some people have a significant protrusion of the eye. (3) Dark shadows in front of the eyes: High myopia can cause vitreous degeneration, liquefaction, posterior vitreous detachment, etc. There are turbid and floating objects in the vitreous, and patients can see flying mosquitoes, Mars dots and flashes. (4) Fundus changes: arcuate spots are visible next to the optic papilla, the retina is highly leopard-shaped, retinal atrophy spots (Fuchs spots) are visible, and macular degeneration. (5) Vision loss: High myopia can cause cataract and macular hemorrhage, which can cause significant vision loss and, most seriously, retinal detachment, which can lead to blindness and eye atrophy in severe cases. High myopia should pay attention to the following matters: (1) Before the age of 45, you should wear a full degree of glasses, so that the ciliary muscle can be exercised. (2) Choose refractive surgery carefully, LASIK is appropriate below -15.00D; intraocular lens implantation can be considered above -15.00D. (3) Avoid strenuous, impacting head movements to prevent retinal detachment. (4) Eat less spicy food, avoid smoking and alcohol, and use vasodilators cautiously to prevent repeated bleeding in the macula of the fundus. (5) Choose your career carefully, avoid heavy physical labor and work that uses too much eye, and the unit should be taken care of. (6) Regular eye examination.