Cataract patients with dark shadows in front of their eyes after surgery are usually due to vitreous clouding, or the presence of fundus lesions. Cataracts occur in the elderly, and may be combined with vitreous clouding. Before cataract surgery, the symptoms of vitreous clouding are not obvious because of the poor vision of the patient, but after cataract surgery, the patient’s vision improves, and the symptoms of vitreous clouding caused by the floating black shadows in front of the eyes will become obvious. Because of cataract, there are preoperative fundus lesions undetected, such as macular degeneration, edema, etc., can also cause postoperative eye black shadow discomfort symptoms, need to further improve the fundus examination to confirm the diagnosis. Cataract patients with dark shadows fluttering in front of their eyes after surgical treatment are recommended to go to the hospital in a timely manner for standardized treatment under the guidance of the doctor.