Pathological mosquito flying is seen in front of the eyes many small black dots flying, like many small mosquitoes, and the size of the number, especially in the white background when more obvious, sensitive people can depict his symptoms. Many flying mosquitoes exist for a long time and remain the same throughout the year, without affecting vision. After examination there is no ocular pathology, which is of little clinical importance and need not be considered. But some elderly people will be accompanied by chorioretinitis or other concomitant symptoms, as well as the formation of retinal fissures, or retinal blood vessel rupture hemorrhage, etc., which should be treated.