Highly myopic patients who have had posterior vitreous detachment and flashes of light for 10 years are likely to go away on their own. Patients with high myopia are prone to post vitreous detachment, and when the post vitreous detachment is not yet completely detached, the part of the retina that is more tightly adhered to the retina will pull and tear the retina along with the movement of the vitreous body, which causes abnormal stimulation of the retina, thus causing the flashing sensation. When the posterior vitreous detachment is completely detached, the retina will no longer be stimulated, and the flashing sensation will disappear on its own. When the posterior vitreous detachment is not completely detached, patients must avoid strenuous exercise and trauma to the eye, so as to avoid complications such as retinal tear and foraminal detachment. It is recommended that patients who experience frequent flashes of light in their eyes should seek prompt medical attention to evaluate their condition and follow the doctor’s instructions for treatment.