Flying mosquitoes is also their own feeling of mosquitoes flying back and forth in front of their eyes, the current consensus of ophthalmologists consider or the body’s natural aging, resulting in vitreous degeneration, thus causing the symptoms, the scientific name is called vitreous turbidity, commonly known as “flying mosquitoes”. There are many ways to detect vitreous turbidity, according to the equipment of each hospital, the following are the main tests, such as ophthalmoscopy, B-mode ultrasound and slit lamp examination. B-type ultrasound examination of the vitreous body, it can clearly display the cross-sectional image of the vitreous body, so you can visually observe the translucency of the vitreous body and the internal liquefied turbidity, and the image is rich in solid sense, and the real anatomical structure is closer, so in the ophthalmology used more, and for the diagnosis of mosquitoes is very helpful. Some retinal detachments only appear as mosquitoes in the early stage without visual impairment, which can be easily missed without ultrasound. Slit lamp exams and fundoscopes are more common and convenient forms of ophthalmology, and are loved by ophthalmologists because they allow the doctor to visualize the vitreous humor. Not every examination device is foolproof, and each patient’s situation is different, so depending on the patient and the specific situation, the doctor will choose a better examination method. Only by actively cooperating with the doctor can the patient’s specific disease be clarified as early as possible for early treatment.