Seeing dark shadows in the eyes may be mosquito, should be promptly examined in the hospital to determine whether the fundus lesions or hemorrhage. 1. Physiological Aedes aegypti: most of the physiological Aedes aegypti is with age, vitreous body liquefaction, degeneration, so that the refractive interstitial turbidity, thus causing a black shadow in front of the eyes, this situation can be observed. 2. Pathological Aedes aegypti: Pathological Aedes aegypti should be alert to the possibility of fundus disease. Fundus lesions such as retinal tears, retinal degeneration, retinal detachment, etc.; and diabetic retinopathy, macular degeneration in the elderly and hypertension caused by retinal vein occlusion and other fundus hemorrhagic diseases, may lead to pathologic Aedes aegypti. Dark shadows in front of the eyes, need to promptly go to the hospital, under the guidance of the doctor active treatment.