The main complications of high myopia are: 1. Retinal fissure and retinal detachment: This is caused by traction of the vitreous meshwork, or infiltration of the liquefied vitreous into the subretina. There is often a flashing sensation before the retinal detachment, which is an irritation symptom caused by pulling the retina. 2.Macular prometaplasia: Initially, it manifests as weakening of vision and distortion of visual objects, which can eventually lead to complete loss of central vision. 3.Glaucoma: Due to the thin sclera of highly myopic eyes, it is not easy to be detected by general IOP measurement, so it is long ignored. Some people use Xiu’s IOP meter to measure IOP and prove that the incidence of open-angle glaucoma is 6-8 times higher in highly myopic eyes than in normal people. Therefore, when examining high myopia, one should not mistake pathological glaucomatous papillary defects for myopic papillary defects, thus delaying treatment. 4. Complicated cataract: High myopia is often associated with cortical clouding of the posterior pole of the lens. This is due to the lesion of the pigment epithelium of myopia which inevitably affects the photochemical change reaction process of the optic cells. The treatment of high myopia: 1. Lens correction: It is still believed that lens correction is the best treatment for myopia. children and adolescents under the age of 15 must have their pupils dilated before prescription lenses in order to obtain the correct myopia. Then with moderate concave lenses, the vision will be corrected. 2, corneal contact lenses: high myopia or a large difference in refractive error between the two eyes, you can wear contact lenses. This can expand the field of vision, avoid breaking the phase, reduce the aberration, and maintain binocular vision function. Youth myopia can not only improve visual acuity, but also compress the cornea to prevent the development of myopia. 3.Excimer laser treatment: This laser is produced by fluoride and has a wavelength of 193nm ultraviolet light. It can break the intra- and intermolecular chains of tissues to make the tissues fall off, and there is no damage to the surviving tissues because there is no thermal effect. It is suitable for myopic eyes over 18 years old, and its correction effect is the same as wearing a lens. 4, lens removal: highly unilateral myopic eyes, after the removal of the lens, some can become orthokeratology. Without any lens correction, better vision can be obtained. However, the post-operative refraction should be estimated in advance for this procedure, which is calculated as the loss of 10.0D of refractive power after lens removal in orthokeratology eyes. The refraction after lens removal in myopic eyes is the refraction of 10.0D plus the general refraction of myopic eyes (i.e. 10+M/Z). 5. This highly myopic eye can also have a clear lens anterior chamber type posterior chamber type IOL implantation.