Flashing sensations in the eye are due to a pulling of the retina by the posterior vitreous membrane, which tends to occur during rapid head or eye turning. Clinically, flashing sensations can occur in physiological or pathological conditions. In physiological cases, posterior vitreous detachment occurs. As people age, the vitreous liquefaction shrinks and the volume shrinks, and the posterior vitreous membrane, which was closely attached to the retina, is peeled off from the retina, and in the process of detachment, the part that was closely attached to the retina is pulled on the retina, resulting in flash sensation. The pathological condition is mainly seen in patients with proliferative vitreoretinopathy, where a large amount of mechanized material exists in the vitreous and is connected to the retina, and when the eye moves, the mechanized material will pull on the retina, resulting in a flashing sensation, which is very dangerous and may cause retinal detachment and requires timely surgical treatment.