Vitreous turbidity and posterior detachment can be divided into two causes: the first is physiological, mostly seen in middle-aged and elderly people and myopic people, refers to the growth of age or myopia, the vitreous gradually from jelly to liquefied state, there will be vitreous turbidity, and because the eye axis is gradually elongated, so the vitreous will also be gradually detached from the surface of the retina, this situation is called posterior detachment. These two conditions are physiological phenomena and will not have any effect on vision, and only require regular ultrasound examinations of the eye to determine whether there is retinal detachment. The second is mainly due to diseases of the fundus, such as vitreous hemorrhage or retinal lesions. In this case, we must go to the hospital for fundus examination as soon as possible, and if there is retinal detachment or retinal fissure, early surgical intervention is needed.