Definition of flying mosquitoes: normal people look at white objects or blue sky, can be found in front of the floating dots or filaments floating, sometimes closed eyes can also see, but objective examination can not find any vitreous lesions, this phenomenon is called physiological flying mosquitoes. This phenomenon is called physiological mosquitoes. It is generally believed to be due to the projection of the cells of the vitreous cortex or the blood cells walking in the retinal vessels on the retina. No treatment is needed. What are the precautions for vitreous turbidity? 1, usually pay attention to rest do not overuse of eyes, to avoid the formation of myopia. Do not “do not turn your eyes”, pay attention to frequent and complete blinking action, blinking often can reduce the time the eye is exposed to the air, to avoid tear evaporation. 2, do not blow too long air conditioning, avoid airflow over the seat, and place tea near the seat to increase the surrounding humidity. 3, eat a variety of fruits, especially citrus fruits, should also eat more green vegetables, grains, fish and eggs. Drinking more water is also helpful to reduce dry eyes. 4.Maintain good living habits, get enough sleep and do not stay up late. 5.Avoid long time continuous operation of computer, pay attention to rest in between, usually 1 hour continuous operation, rest 5-10 minutes. When resting, you can look away or do eye exercises. 6, maintain a good working posture. Maintain a most appropriate posture, so that the eyes flat or mildly downward looking at the fluorescent screen, which can make the neck muscles relaxed, and make the eye exposed to the air to reduce the area to a minimum. 7, adjust the distance position of the fluorescent screen. The recommended distance is 50-70 cm, and the fluorescent screen should be slightly lower than the horizontal position of the eye 10-20 cm, a 15-20 degree downward perspective. Because the angle and distance can reduce the demand for refraction, reduce eye fatigue situation. 8, if you would have less tear secretion, eyes prone to dryness, in front of the computer is not suitable for the use of contact lenses, to wear frame glasses. For those who wear contact lenses in front of the computer, it is also best to use varieties with a high degree of oxygen permeability.