The main symptoms caused by vitreous pulling on the retina are flash sensation and loss of vision, a condition that is classified as physiological or pathological. In the physiological case, the vitreous liquefies with age, changing from a homogeneous gel-like consistency to a liquid with fibrous floaters in it. These floaters will pull on the retina in places where the retinal traction is close, such as around the optic papilla, around the large blood vessels, and in the macular area, and will produce a certain pull on the retina, and a flashing sensation, like a lightning bolt, will be noticed at a certain location during strenuous movements or when turning the eyes. Some patients will be very nervous to come to the clinic. Most of this condition is physiological and there is no need to worry too much. If the retina is examined without localized degeneration or fissures, it is completely observable and the flashing sensation can disappear on its own with the gradual separation of the vitreous and retina. In some pathological cases, such as retinal vein blockage and diabetic retinopathy, proliferative membranes will grow in the fundus, and these proliferative membranes, when pulling on the retina, will not only produce a flashing sensation, but also produce hemorrhage, which will affect vision and even cause retinal detachment. This situation is more serious, and it is necessary to go to the hospital in time for active treatment.