Flying mosquitoes in front of the eyes is due to fundus diseases, according to the different causes are divided into two kinds: the first is the physiological vitreous clouding, this condition is also called flying mosquitoes, belongs to the physiological phenomenon, seen in people with high myopia and the middle-aged and elderly, because it is a physiological phenomenon, so it will not affect the vision, so this situation does not need to deal with. The second is pathological vitreous clouding, such as vitreous hemosiderosis, this disease is more serious, secondary to other diseases of the eye, such as fundus hemorrhage, diabetic retinopathy, retinal vein blockage and so on. So after the emergence of mosquitoes in front of the eyes, you need to go to the hospital early for fundus examination, first of all, to exclude the possibility of pathological changes, after the exclusion of this situation, the basic consideration belongs to mosquitoes, there is no need to deal with.