There are two types of dark fluttering shadows in the eyes, one condition is physiological and one condition is pathological. Most people are physiological, may be very good vision, no loss, but there is a black shadow for a long time, this situation is likely to be physiological mosquito flying. The eye has a structure called vitreous, accounting for 4/5 of the volume of the eye, the normal vitreous is a transparent jelly-like material, with the growth of age or myopia, the jelly-like vitreous will degenerate, degeneration will precipitate some liquid, the human eye through the liquefied vitreous see things, there will be some black shadows, these black shadows have a line, there are like cotton wool, and Some flakes, each person feels different. This is a physiological change, it is not a disease, and there is no need to panic. There is another condition that is pathological, such as vitreous or retinal hemorrhage or uveitis, which can also cause fluttering black shadows, and it is important to distinguish this condition clinically. Therefore, if you have flying shadows in your eyes, go to the hospital and let the doctor determine whether it is physiological or pathological. If it is physiologic, there is no need to be nervous; if it is pathologic, targeted treatment should be taken.