If the front of the eye can clearly feel the black filament or black stripes floating, especially when looking at the bright background or white wall more obvious, this condition is usually considered vitreous turbidity, similar to a flying mosquito floating in front of the eyes so also known as flying mosquitoes. This condition is usually considered physiological, usually does not affect vision, and does not hurt, the clinical is mainly to observe, will not take any intervention, and there are not many ways to improve this symptom. Since it is physiological, it will not bring bad consequences and observation is the main focus. However, if there is an obvious black shadow covering the eyes or a feeling of discharge, it is necessary to go to the hospital to examine the fundus in time to exclude retinal fissure and detachment.