Many small bright flashes in front of the eyes, i.e., a flashing sensation within the eyes. If caused by eye diseases such as vitreous clouding, surgery is needed if necessary; if caused by brain diseases such as tumors, surgery is needed to remove them. 1. Eye diseases. Vitreous clouding can cause retinal pulling for a short period of time, resulting in flashes of light in the eyes. Patients are advised to go to the hospital for funduscopic examination to determine the presence of retinal degeneration or vitreous clouding and other eye diseases. If there is a risk of vitreous pulling or retinal detachment, timely intervention is needed. If the examination is normal, temporary observation and regular review can be done. 2. Brain diseases. Brain tumor compression and other diseases can stimulate the nerves to cause flashing sensation in the eyes. It is recommended that patients undergo cranial nuclear magnetic examination, and under the guidance of the doctor to clarify the cause of the disease for treatment. In conclusion, eye diseases such as vitreous clouding or brain diseases such as tumors may cause flashes of light in the eyes, and it is recommended that patients go to the hospital in a timely manner and under the guidance of the doctor for appropriate treatment.