Posterior vitreous detachment is an ophthalmic disease caused by aging phenomenon, which refers to the vitreous body detaching from the position immediately adjacent to the retina, and can cause patients to experience symptoms such as flashing sensation and water ripples when seeing things. Posterior vitreous detachment is a common ophthalmic disease that occurs in middle-aged and elderly people, especially in patients with high myopia. It is usually caused by aging factors that result in the gradual liquefaction of the vitreous body, and the posterior vitreous membrane separates from the position immediately adjacent to the retina. After the occurrence of posterior vitreous detachment, patients may have symptoms such as flashes of light in front of the eyes and water ripples, etc. The diagnosis can usually be confirmed by detailed ultrasound examination. Posterior vitreous detachment usually does not require treatment, but patients should avoid strenuous exercise and exposure of the eye to external forces. If the posterior vitreous detachment is incomplete, it may pull and tear the retina, which may lead to complications such as foramen ovale retinal detachment. It is recommended that patients with significant discomfort and symptoms of posterior vitreous detachment seek prompt medical attention to evaluate their condition and follow the doctor’s instructions for treatment.