Feeling something flying in front of the eyes, especially black filaments, black dots or black bars in front of the eyes, especially when looking at the bright background or white wall is more obvious, this situation is considered vitreous opacity, that is, flying mosquitoes. Flying mosquitoes is a physiological vitreous clouding, is due to the growth of age or myopia caused by the phenomenon of vitreous opacity. It is a physiological changes, so the clinical is mainly to observe, and do not take treatment, will not affect vision, and will not bring bad consequences. If there is an increase in flying mosquitoes in a short period of time, or there is a large black shadow covering or a flashing sensation in the eye, you need to go to the hospital in time for consultation to exclude degeneration and fissure of the fundus, or even to exclude retinal detachment. If there are such dangerous conditions, laser or surgical treatment may also be required.