Ophthalmologists often hear patients complain that sometimes there are translucent black shadows floating in front of their eyes, some like circles, some like curved lines, some like smoke, some like flies or mosquito wings, in various shapes, floating up and down with the rotation of the eye. What is this disease? The medical symptoms are called “flying mosquitoes”, most belong to a physiological phenomenon, rather than a disease, why would have this phenomenon? This is because the light into the human eye through a tissue called the vitreous refraction to form an image on the retina, under normal circumstances the vitreous body is colorless and transparent gel-like body, will not block the light into the eye, when the vitreous body has residual embryonic cells and degenerated cells, the image of these cells projected on the retina, which is like a glass of water floating in a few tea leaves, the same, the eyes will A black shadow appears in front of the eyes. These dark shadows are light in color, translucent, and few in number, and they appear gradually and do not change over time. If the bare eye vision or corrected vision is good and the fundus is normal, there is no need to worry and no need for treatment, as long as you do not pay too much attention to it, it will not have any impact on your life. Are all black fluttering shadows in front of the eyes a physiological phenomenon? Not at all. If the number of black shadows is so large that it is impossible to count them, and the color is so thick and black that it seriously blocks the vision, and the eye rotates like dust, floating and wandering, this kind of black shadows floating is vitreous turbidity, which is a pathology. In other cases, the black shadow floating in front of the eye is like a piece of cloth, with a large range, and the vision is blocked in a certain direction, which is also a pathological condition, and it is likely that the retina is detached. If the latter two conditions are present, you should go to the hospital promptly for a dilated pupil examination to clarify the cause and treat the problem. There are many causes of vitreous clouding, summarized in four main areas: 1, vitreous degeneration: mostly seen in elderly patients with fundus arteriosclerosis, hyperlipidemia and high myopia, mainly degenerative changes of the vitreous. 2, inflammation of the vitreous and pigment free: mainly caused by intraocular tissue inflammation or pigment cell detachment into the vitreous clouding. Such as chronic uveitis, retinitis, etc. 3, vitreous hemorrhage: This is the most common vitreous clouding. Caused by a variety of reasons, such as retinal perivasculitis, venous obstruction, hypertension and diabetes-induced fundus lesions and eye trauma can cause vitreous hemorrhage. 4, there are some rare causes: such as congenital vitreous degeneration clouding, vitreous amyloidosis, vitreous cysticercosis and other causes can cause vitreous clouding. Regarding the treatment, according to the causes of vitreous turbidity different treatment methods are also different For vitreous degenerative changes, because the impact on vision is not significant, can follow the observation, not urgent treatment, usually pay attention to diet, eat less high-fat, high cholesterol food, eat more vegetables, fruits, delay the arteriosclerosis of the fundus, reduce lipids, in order to slow down the process of degenerative changes. For chronic uveitis, retinitis, vitreous cysticercosis and various causes of vitreous hemorrhage caused by vitreous turbidity, should be examined in the hospital, receive regular treatment by ophthalmologists, including drug therapy and surgery when necessary. In short, if you encounter a black shadow floating in front of the eyes, it is best to go to the hospital to ask the doctor to clarify is the physiological “mosquito flying syndrome “What is the cause of vitreous clouding, especially the symptoms are heavy, as mentioned earlier, the number of black shadows, and the color is thick black, obscuring the vision is serious, as well as in front of the black shadow is like a piece of cloth, the scope is larger, and there is a certain direction of vision is obscured, should promptly go to the hospital for examination and treatment.