After cataract surgery, many older adults notice “unidentified flying objects” in front of their eyes, or they may be more visible than before surgery. They come in different shapes, such as mosquitoes, cobwebs, dots, lines, butterflies, circles, and so on. They float in front of the eyes, visible, but not touchable, lingering, very annoying. Ophthalmology collectively called this phenomenon “flying mosquitoes”. This picture below simulates the human eye to see these “flying mosquitoes” look. So, what exactly are these “flying mosquitoes”? Is it related to cataract surgery? Will it lead to blindness? The following to answer questions one by one to solve the problem. A, “flying mosquitoes” of the cause of the eye in the “vitreous”. Vitreous humor is a colorless, transparent, jelly-like material, filled in the eye. With age, as people appear gray hair, cataracts will occur, the vitreous body will also “aging”, vitreous liquefaction degeneration, concentration, etc., resulting in the vitreous cavity cloudy material, or vitreous and retinal separation (vitreous detachment), this physiological change is the cause of ” This physiological change is the most common reason for “flying mosquito”. Is it related to cataract surgery? The place where the cataract is suffered, and where the cataract surgery is performed, is in front of the vitreous, so “flying mosquitoes” is not related to cataract surgery! Cataracts in the elderly cause blurred vision and decreased contrast sensitivity, which also affects the observation of these “flying mosquitoes”. After cataract surgery, due to improved vision and clearer vision, the phenomenon of “flying mosquitoes” can be subjectively perceived or more pronounced than before surgery. Generally speaking, when you can’t see the world, you don’t realize the good and bad; but when you can see the world clearly, you have to accept its beauty and defects! Third, will affect the vision? In most cases, “flying mosquitoes” is a physiological phenomenon, there is no special treatment, you can try to slowly adapt to it, get used to it. In a few cases, some sudden “flying mosquitoes” in front of the eyes are related to eye diseases, such as vitreous hemorrhage, retinal fissures, retinal detachment, intraocular inflammation, etc.. Therefore, if the “unidentified flying objects” in a short period of time increasingly aggravated, with a sense of flash, vision loss and visual obscuration, or should go to the hospital for fundus and eye ultrasound examination, to rule out eye disease.