Black shadows in the eyes are still blurred, generally considered to be visual fatigue, mosquito, retinal detachment and other reasons. 1. Visual fatigue: due to patients stay up late, play cell phones, watching computers or irregular work and rest, etc., can lead to patients with vision loss, may also appear in front of the black shadow fluttering, blurred vision performance. Usually we should develop a good routine, avoid staying up late, long time to see electronic products. 2. Mosquitoes: Mosquitoes often appear in front of a black shadow in front of the floating, shaped like a spider web or small black dots, this situation will lead to serious vision loss, blurred. 3. Retinal detachment: retinal detachment can also lead to the patient’s eyes with black shadow fluttering and blurred, there will also be a sense of flashing light, sense of blockage, if the treatment is not timely may seriously affect the vision or vision loss. It is recommended that patients with dark shadows in the eyes and unrelieved blurred vision consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.