Vitreous turbidity is not a disease name, but the most common pathological changes in the vitreous, many people know the existence of this pathological changes, but do not know the reasons for its appearance, I will talk about the following, the common symptoms and causes of vitreous turbidity? 1, mild: patients feel that the black shadows floating in front of their eyes, like flies flying. The onset of the disease is sudden, and the disease develops quickly. With the vitreous turbidity of the site and the degree of different degrees and affect the degree of vision is not the same. Mild clouding does not affect vision, and cannot be detected by examining glasses. 2, more significant clouding: common in degenerative myopia, uveitis and vitreous hemosiderosis. Patients feel a coarse and large amount of dark shadows in front of their eyes, with varying degrees of visual acuity loss. Examination of the fundus may reveal floating blocks such as dust or thick strips of flocculent cords, and in severe cases, the fundus cannot be seen, or even no red light reflection in the fundus. It is dark. 3.Inflammatory clouding: When the nearby tissues are inflamed, it is caused by white blood cell excretion and protein agglutination. It is a common manifestation of various retinal and uveitis. Such as tuberculosis and syphilitic chorioretinitis, etc., fishing spirochetal uveitis, uveal brain for migratory endophthalmitis, etc. 4, hemorrhagic clouding: common in trauma, surgery, various retinal vascular diseases and blood clots. 5, degenerative clouding: seen in high myopia, retinal detachment, vitreous calcium and cholesterol deposition, etc. 6.Congenital clouding: Most of the embryonic mesenchymal tissue remains. 7.Other: such as intraocular foreign body, porcine cysticercosis, retinoblastoma, etc., can cause vitreous clouding.