Flashing eyes can be caused by astigmatism, for example, or by posterior vitreous detachment or retinal detachment. When flashes of light appear in the eyes, you should consult a doctor in time to find out the original cause of the disease. 1. Astigmatism: Most astigmatism is related to congenital factors, but may also be related to corneal diseases, trauma and other acquired factors. Astigmatism may be characterized by flashes of light in front of the eyes, and the most significant feature is the blurring of vision at a distance, which should be examined in an eye hospital in time. 2. Posterior vitreous detachment: common in the elderly, due to vitreous metabolism dysfunction, vitreous clouding and so on, often manifested as a flashing sensation in front of the eyes, black shadows in front of the eyes and so on. 3. Retinal detachment: due to retinal detachment, patients may have flashes of light in front of their eyes, which may be accompanied by symptoms such as vision loss. Patients with flashing eyes should go to the ophthalmology hospital in time, and the doctor will clarify the cause of the disease and then give targeted treatment. If not treated in time, serious cases may lead to blindness, affecting the patient’s life.