Flashing sensation in the eyes, usually manifested as a bright white strip or light in front of the eyes, as if lightning passed through, and this symptom is usually seen in major refractive error or fundus disease, especially retinal lesions, may appear similar manifestations, such as retinal fissure or retinal detachment in the early stage, usually in the beginning, the frequency of flashing is relatively low, may appear occasionally, as the disease As the condition worsens, the above-mentioned manifestations will become more frequent and last for a longer period of time. Once the above symptoms appear, it is necessary to improve the fundus examination early to clarify whether there is retinal lesion, if it is retinal fissure, retinal laser photocoagulation can be performed to close the fissure to prevent further aggravation of the lesion. If it is retinal detachment, retinal surgery should be performed as soon as possible to prevent the detachment from becoming more extensive and causing serious damage to the retinal tissue.