Retinal detachment is a detachment between the neuroepithelial and pigment epithelial layers of the retina. Retinal detachments are generally classified into three types: foraminogenic, retractive and exudative. Pore-derived retinal detachment is the most common type. It can occur at any age and can occur in both eyes successively, with a high incidence in myopic patients, especially in highly myopic patients. Clinical manifestations: Initially, flashing sensation and flying mosquito sign appear, with the development of retinal detachment, black shadows in front of the eyes obscure and gradually increase in size; when the macula is involved, visual distortion or severe vision loss occurs. Fundus examination: The retina in the detached area is blue-gray elevated, and most of the retinal fissures can be detected by dilated pupil examination. As the detachment expands, it can cause total retinal detachment, with a severe funnel-shaped appearance. Treatment: 1. For retinal fissure only, laser can be used to close the fissure if there is no or only a small amount of detachment. 2.External (extra-scleral pad pressure) repositioning method. For some relatively simple patients, the fissure can be closed by silicone pad pressure outside the sclera or ring ligation, condensation, and if necessary, combined with vitreous cavity gas injection to reset the detached retina. 3. Internal (vitreous cut) reset method. For some complicated cases, long detachment combined with vitreous proliferation, huge fissure, macular fissure, etc., it is difficult to reset by external methods, so vitrectomy combined with inert gas or silicone oil injection is needed to reset the retina. Prognosis: After retinal detachment occurs, if not reset in time, the retina will be atrophied and degenerated, resulting in irreversible damage to visual function, even if the surgery succeeds in anatomically resetting the retina, it will be difficult to restore vision. Long-term retinal detachment can also be complicated by iridocyclitis, pupillary atresia, cataract, glaucoma, and even ocular atrophy. Therefore, early diagnosis and treatment can maximize the preservation of visual function. For patients with high myopia and those who have had retinal detachment, regular dilated pupil check is especially important.