The flashing sensation when moving the eye rapidly is mostly caused by the vitreous body pulling on the retina and causing abnormal stimulation to the retinal cells. Some patients may experience flashes of light when rapidly rotating their eyes, mainly due to the posterior detachment of the vitreous body after liquefaction, and the relative displacement between the vitreous body and the retina with the movement of the eyeball, which pulls on the retina and causes abnormal stimulation of the retinal cells, resulting in flashes of light in front of the eyes of the patients. Patients can confirm the diagnosis by going to the ophthalmology department of the hospital for a detailed fundus examination and ultrasound examination. For patients who experience flashes of light when turning their eyes, they should avoid strenuous exercise and eye trauma, otherwise the liquefied and post-detached vitreous humor may pull and tear the retina to form retinal detachment. It is recommended that patients who experience frequent flashes of light in front of their eyes should seek prompt medical attention to evaluate their condition and follow the doctor’s instructions for treatment.