The reason why the eyes have black shadows

There are several different cases of black shadow in front of the eyes. One is floaters. The patient will show black spots in front of his eyes and fly around with the rotation of his eyes. When the patient looks at a bright background such as blue sky and white walls, it is easier to find. Clinically, about 70% of floaters are physiological floaters caused by vitreous liquefaction or detachment. Generally, no special treatment is required. Retinal detachment occurs partially, the detachment of the opposite side of the field of vision shows a fixed cloud-like shadow, manifested as a sudden shadow in front of the eyes, can be accompanied by a sense of flash, the number of mosquitoes will continue to increase in the short term, covering the impact of vision.