1.What is retinal detachment The so-called retinal detachment is not a detachment of the entire retina, but a separation between the neuroepithelium and pigment epithelium of the retina. In anatomy, the retina is divided into two layers, the pigment epithelium and the neuroepithelium, just like the lining of a garment. Once the face and lining are separated for some reason, the retinal detachment will appear in clinical terms. 2.Why vision will be lost after retinal detachment Retinal detachment will lead to the impaired function of photoreceptor cells and pigment epithelial cells on the retina, which cannot work normally, and because the photoreceptor function of the damaged part is impaired, the damaged retina can’t see clearly as we see in the dark, so it can lead to vision loss. Because of the high oxygen demand of retinal cells, a short period of retinal detachment can also lead to the failure to restore the function of damaged cells. Therefore, most of the retinal detachments have poor vision recovery after surgery. 3. Factors affecting the recovery of vision after surgery The visual acuity of retinal detachment varies greatly after surgery. The longer the detachment, the more extensive the detachment, the more damaged retina, the worse the visual acuity; ② the involvement of macula, the macula’s photoreceptor function is very active, although it only accounts for one tenth of the retina, but it is behind the control of the sharpest part of the central vision (about 0.9 vision), as for the remaining nine tenths of the retina is responsible for the side vision (about 0.1 vision). When a retinal detachment occurs, the first to be affected is the paramacular retina, which then gradually spreads to the central macula, and can even cause blindness if not seen in time. Recovery is usually limited after surgery. In addition, the complexity of the surgery is related to the postoperative vision. If the surgery is complex especially when annuloplasty is required, refractive changes will occur, which also contribute to poor postoperative vision. This type of vision loss can be improved by lens correction. In conclusion, the longer the retinal detachment and the more extensive the detachment, especially involving the macula, the majority of vision recovery is poor.