Cataract patients with black spots floating after surgery may be caused by vitreous clouding or vitreous hemorrhage. Vitreous clouding: cataracts occur in middle-aged and old people, and may be accompanied by vitreous clouding, which is a normal aging phenomenon. After cataract surgery, due to the improvement of visual acuity, the original vitreous clouding may show more obvious symptoms, resulting in black dots fluttering in the field of vision. Vitreous hemorrhage: patients with underlying diseases such as hypertension and coagulation disorders may experience a small amount of hemorrhage into the vitreous cavity during cataract surgery, and may also have the symptom of postoperative black spot fluttering, which can be diagnosed by detailed funduscopic examination and ophthalmologic ultrasound examination. Black spots after cataract surgery should go to the ophthalmology department of regular hospitals in time, and be guided by physicians to check and take targeted treatment.