Eyes like bugs crawling, especially when looking at a bright background or a white wall, it feels like there are black bugs crawling in front of the eyes, similar to the fluttering of flying mosquitoes, so also known as flying mosquitoes. This is actually a physiological vitreous clouding, mainly due to ageing or myopia deepening caused by vitreous degeneration, opaque phenomenon. General clinical can use to improve microcirculation drugs or iodine preparations to reduce the degree of clouding. If there is a flashing sensation in the eye or a large black shadow covering the eye, it is necessary to promptly go to the hospital to examine the fundus to exclude hemorrhage, fissure and degeneration of the fundus, and to promptly deal with it.