Retinal detachment is one of the more serious and common blinding eye diseases. The retina is a translucent membrane in the eye, an important tissue for sensing external light information, located at the bottom of the eye, with a very fine network structure and rich metabolic and physiological functions. The retina is divided into ten layers, including nine layers of neuroepithelium, which is the light-sensitive layer of the eye, and the pigment epithelium outside the neuroepithelium, with a potential gap between the two layers. Retinal detachment is the separation of the retinal neuroepithelial layer from the pigment epithelial layer. After retinal detachment, the blood supply from the choroid is not available, and the pigment epithelium is easy to free and atrophy, if not restored in time, the vision will not be easily recovered. Retinal detachment is mostly seen in people aged 40-70 years old, most of whom have high myopia. Finding the fissure and surgically closing the fissure is the key to treating this disease. The size and number of fissures varies. They can be round or horseshoe-shaped, but also striated, jagged-edge detached and irregularly shaped. Total vitreous detachment produces a pulling effect, and the peripheral retina is a good area for all kinds of retinal degeneration, so it is very easy to be pulled and cause retinal fissures, which is why the fissures are mostly located in the peripheral retina in retinal detachment. The detached retina is sometimes so elevated that it can obscure the fissure, and the patient may be asked to change the head position during the examination. The patient may be asked to change the head position during the examination. The eyes may also be bandaged and bedridden for 1 to 2 days, and then examined when the augmentation decreases. There are early symptoms of retinal detachment, and only early detection can lead to early treatment. The early symptoms of retinal detachment are as follows: (1) Flying mosquitoes and flashes of light: they appear earliest. It is actually a symptom of posterior vitreous detachment. Middle-aged and elderly people, especially highly myopic patients, should be alerted to the possibility of retinal detachment when a large number of flying mosquitoes and persistent flashes of light in a certain direction then appear. (2) Loss of central vision: The retinal detachment in the posterior pole part has a sharp loss of vision. When the peripheral part is first detached, it has no or very little effect on central vision. Again, detailed fundus examination should be performed in high-risk patients with visual acuity loss. (3) Visual distortion: When peripheral retinal detachment spreads to the posterior pole or shallow detachment occurs in the posterior pole, in addition to the loss of central vision, there is also visual distortion. (4) Visual field defect: When retinal detachment occurs, some sensitive patients can detect visual field defect. However, only the lower visual field defect has early diagnostic value.