The flashes in the corners of the eyes may be caused by vitreous clouding, overuse of the eyes or retinal diseases. 1. Vitreous clouding: With age, vitreous clouding occurs, which makes people feel that there is a flashing sensation in front of their eyes. This is a physiologic form of vitreous clouding, which does not affect vision and is not a cause for concern. 2. Excessive use of eyes: prolonged use of cell phones, computers, watching TV and other electronic products lead to excessive use of eyes, causing visual fatigue, there will be flashes of light in the corners of the eyes. This situation can be relieved by paying more attention to rest and avoiding overuse of eyes. 3. Retinal diseases: If the patient suffers from retinal tears or retinal detachment eye diseases, there will also be flashes of light in the corners of the eyes. If the frequency of eye flashes is getting higher and higher, it should be taken seriously and go to the hospital in time.