If there are black dots floating in front of the eyes, especially when looking at a bright background or a white wall, if there are black threads, dots or black bars floating in front of the eyes, similar to flying mosquitoes floating in front of the eyes, it is a vitreous opacity phenomenon, also known as flying mosquitoes. This phenomenon is usually physiological, mainly due to age or myopia caused by the deepening of the vitreous degeneration, vitreous opacity phenomenon. Because it is a physiological change, so the main clinical observation, do not take any way to treat, and there is no good way to treat this condition. If there is a large dark shadow covering the eye or a sensation of lightning in the eye, you need to go to the hospital promptly and examine the fundus with dilated pupils to exclude the phenomenon of fundus degeneration and fissure. If there is a fissure, laser treatment is also needed.