If there is a dark shadow in front of the eye, if the dark shadow is floating, it is usually considered to be caused by vitreous turbidity, which may be physiological or pathological, and requires prompt consultation at the hospital ophthalmology department. If it is a physiological vitreous clouding, it can be temporarily not treated, but needs to be closely observed, and can be followed up every 3 months in the ophthalmology department. If the vitreous clouding is pathological, timely symptomatic treatment of the vitreous clouding will aggravate the formation of posterior detachment, mainly pulling the retina, which will cause significant vision loss. If the black shadow in front of the eyes is fixed, it may be a corneal foreign body, keratitis or cataract, or it may be caused by various diseases in the macula of the fundus, which also need to go to the hospital for detailed examination to clarify the cause, and clear diagnosis before specific treatment.