If an elderly person has dark spots in their eyes, consider the possibility that the patient may be experiencing flying mosquitoes. Older people with black spots in their eyes should usually undergo a thorough and systematic examination, and the most common clinical cause is mosquito flying disorder. Flying mosquitoes mainly refers to the patient has a floating black shadow in front of the eyes, especially when looking at the white bright background black shadow will be more obvious, some patients will also be accompanied by a sense of flash. Generally speaking, when the patient appears mosquito flying, mainly due to vitreous liquefaction or vitreous detachment, which is a physiological change. So when the elderly appear to have black spots in front of their eyes, they should go to the eye clinic for examination to find out the specific condition of the patient. Most elderly patients with this condition have a physiological change. Depending on the patient’s condition, topical eye drops or oral lecithin complex iodine can be used to improve the patient’s symptoms, and the patient’s condition should be checked regularly.