The causes of vitreous turbidity are more, different causes of vitreous turbidity, the symptoms are not exactly the same, mainly reflected as follows: 1, vitreous mild turbidity is generally manifested as a relatively sudden onset, the development of the disease is relatively fast. Many patients feel that there are black shadows floating in front of their eyes, such as small mosquitoes flying in front of their eyes; 2, more significant vitreous turbidity, the patient feels that there is a coarse and large amount of black shadows in front of the eyes, vision is reduced to varying degrees. The fundus of the eye can be seen to have a dusty or coarse strip of flocculent, rope-like floating cloudy material, and in severe cases, the fundus of the eye can not be seen, and even the red light reflection of the fundus can not be seen, dark. Patients often have a flashing sensation in front of their eyes, and their eyes may be cloudy. These may be caused by retinal fissures due to the pulling of the vitreous and abnormal firing of retinal cells. 3. Other symptoms can also be manifested as bright red blood clots within the vitreous or brownish yellow old blood clots that can be seen under the slit lamp. The examiner can see dusty, streaky or blocky cloudy floaters, or a very faint red light can be faintly seen, or in some cases, even no red light reflection. In patients with recurrent vitreous hemorrhage, proliferative streaks or proliferative membranes with neovascularization may be seen intravitreally.