Common signs of retinal detachment may include fluttering black shadows with flashes of light, fixed black shadows and so on. 1. Black shadow fluttering with flashing sensation: flashing sensation refers to a sense of lightning similar to a rainy day. When the posterior vitreous detachment is incomplete, the fluttering of the vitreous body will stimulate the retina, which will cause a sense of flashing sensation in the retina. When there is a black shadow or flash sensation, it is necessary to do ophthalmologic examination in time, including dilating pupils to check the fundus, checking whether there is retinal tear, retinal hemorrhage, retinal detachment and so on. 2. Fixed black shadow blocking: when retinal detachment occurs, it will be clearly felt that a certain place can not be seen, and there is a black shadow blocking, while simple vitreous clouding without hemorrhage and retinal detachment, vision will not be affected. When there is a fixed black shadow that obscures vision, it is important to consult a doctor promptly, suggesting that a retinal detachment may be present. When black shadows flutter with a flashing sensation and fixed black shadows obscure vision, please go to the hospital and follow the doctor’s instructions for treatment.