Flying mosquitoes medical known as vitreous turbidity, mainly due to vitreous aging, manifested as a shadow in front of the eye, the shadow with the eye rotation and rotation. A, the reason: 1, physiological reasons: some middle-aged and elderly patients due to ageing, the eye will degenerative lesions, resulting in dots or filaments floating in front of the eyes, more obvious in the bright light; 2, pathological reasons: intraocular inflammation, bleeding, trauma, retinal disease may cause vitreous turbidity, manifested as a heavy shadow in front of the eyes, fog, etc., may also be accompanied by visual field defects, flash sensation. Second, treatment: 1, drug treatment: mosquito fly usually use aminopeptide eye drops, usually can be reasonable eye, avoid excessive eye, pay attention to eye hygiene, regular review of vision; 2, surgical treatment: surgical treatment with vitrectomy and laser vitreolysis, can restore eye function, to prevent retinal detachment, after surgery, patients should keep the eye dry and clean, to avoid infection. Third, precautions: flying mosquitoes patients if the occurrence of increased shadow in front of the side, accompanied by vision loss, visual field loss, you need to immediately go to the hospital to prevent the emergence of retinal detachment leading to blindness.