The black dots in front of the eyes usually do not heal on their own, the symptoms are mostly seen in intravitreal clouding caused by mosquitoes, commonly in the elderly, high myopia, eye trauma history of patients. Flying mosquitoes can be divided into physiological and pathological, its symptoms, treatment are different. Physiological mosquitoes appear in the field of view of spots, striped shadows, in the light of the obvious, with the eye can be turned and floating, as if flying mosquitoes. Although not completely cured, but generally does not affect vision, no special treatment. Pathological mosquitoes patients, usually will not heal themselves. If the number of flying mosquitoes increases within a short period of time, sudden or significant loss of vision, we need to be alert to the possibility of retinal fissures, retinal detachment, vitreous hemorrhage and other acute serious fundus diseases, and should be treated in a timely manner. Therefore, if patients appear black shadows, affecting vision, it is recommended to actively go to the ophthalmology consultation, the cause of the symptomatic treatment is the key.