The flashing sensation in patients with high myopia is mostly due to posterior vitreous detachment or retinal detachment, which usually does not persist, and the flashing sensation can be gradually relieved when the posterior vitreous border membrane is completely separated from the retina or when the retina is reset. In addition to sensing light and generating nerve impulses, the retina also generates nerve impulses when it encounters mechanical stimuli, resulting in the formation of a flash sensation. Patients with high myopia are prone to posterior vitreous detachment, and incomplete detachment of the posterior vitreous border membrane will produce tension between the retina, resulting in patients with flash sensation, which usually does not always exist. With the complete detachment of the vitreous humor, the pull between the vitreous humor and the retina will disappear, and the flashing sensation of the patient’s eyes can be gradually eliminated. In addition, patients with retinal detachment may also experience flashes of light in front of their eyes due to the pull on the retina. After the retina is restored, the discomfort is relieved and the flashing sensation is eliminated. It is recommended that patients who experience frequent flashes of light in their eyes seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.