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: the earliest appearance. 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 suddenly appear and flashes of light persist in a certain direction. 2, central vision loss: the posterior pole of the retinal detachment, vision decline sharply. When the peripheral part is detached at the beginning, it has no or little effect on the central vision. Also in high-risk patients with vision loss, detailed fundus examination should be performed. 3.Visual deformation: When peripheral 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 deformation. 4.Visual field defect: When retinal detachment occurs, some sensitive patients can find visual field defect. However, only the lower visual field defect has early diagnostic value.