Cataract patients who have black dots floating in front of their eyes after surgery are usually due to vitreous clouding, vitreous blood accumulation or other fundus lesions, etc. Cataract is a common disease in ophthalmology. Cataract is a common disease in ophthalmology, which occurs in the elderly. It is caused by the turbidity of the lens that affects the light transmittance, and it needs to be treated by surgery to replace the turbid lens with a transparent IOL in order to restore the vision. Cataract patients who have black spots floating in front of their eyes after surgery may be due to the presence of vitreous clouding. Vitreous clouding occurs mainly due to aging factors and can be present before surgery, except that the symptoms become more pronounced after the vision improves after surgery. In the case of dark spots in front of the eyes due to vitreous hemorrhage, vitreous hemorrhage can either be present preoperatively or can be caused by a small amount of intraocular hemorrhage during surgery. The presence of macular edema, macular degeneration and other fundus lesions can also have postoperative dark spots before the eyes, which require a complete fundus examination to confirm the diagnosis. After cataract surgery, we should follow the doctor’s instructions to take good care of the patient and follow up for review. The dark spots in front of the eyes may also be caused by other reasons, which need to be examined to clarify the specific causes.