Flashing white light after an eye injury is still serious and indicates damage to the retina. White light flashes after an eye injury are caused by external stimulation that damages the retina. When the retina is stimulated, it sends out abnormal electrical signals, which are received by the visual center and are perceived as flashes of light, but the severity of the injury varies depending on the damage. In more serious cases, the retina is torn, which can have a serious impact on vision and is difficult to repair. Slightly less severe cases, caused by a contusion in the retina or the formation of a posterior vitreous detachment, can be treated to relieve symptoms. Patients who experience white light flashes after an injury should go to the ophthalmology department of a hospital in a timely manner to be examined by a doctor to determine the severity of the injury.