Flying mosquitoes appear, mainly because the vitreous is cloudy. So, why is the vitreous cloudy? In addition to the aging of the vitreous itself, lesions in adjacent tissues can also lead to vitreous clouding. For example, the uvea, retinal inflammation or retinal vasculopathy resulting in hemorrhage, exudation and eye trauma. Therefore, patients with high myopia, intraocular inflammation, or retinal vasculopathy, as well as cataract and other internal eye surgery, should be more vigilant. In the past, the appearance of mosquitoes is often after 40 years old, but now with the increase in pressure, mosquitoes patients are getting younger and younger. Many white-collar workers and students, because of the long-term use of computers, resulting in visual fatigue or myopia increases year by year, also joined the army of patients with flying mosquitoes. Therefore, pay attention to eye health, regular eye examinations, is to stay away from the root of the disease. Regular outdoor exercise is good for eye health and reduce visual fatigue, especially to improve the ability to defend against retinal vascular disease. In addition, highly myopic people should pay attention to avoid strenuous sports and external impact. Pay attention to the reasonable use of eyes, it is best to take a break after reading for a period of time; balanced diet, eat more eye-friendly food, such as food rich in B vitamins, as well as wolfberry, Tianqi, etc.