Suddenly there is a black shadow floating in one eye, we should first clarify the diagnosis, for example, it is caused by vitreous clouding or vitreous hemorrhage, etc., and can be treated by medication or surgery. Suddenly there is a black shadow floating in one eye, may be due to vitreous clouding or vitreous hemorrhage, need to go to the ophthalmology department of the hospital in time to do fundoscopy, ophthalmic ultrasound examination and so on to confirm the diagnosis. If it is caused by vitreous clouding, do not be too nervous, you can take oral lecithin complex iodine tablets to promote its absorption. If it is caused by vitreous hemorrhage, it needs to be treated with medicines that activate blood circulation and remove blood stasis, such as Hexue Mingmu Tablets and Haifuyuyuyu Capsules. If the hemorrhage gradually worsens or fails to be absorbed, vitrectomy should be considered. Suddenly there is a black shadow in one eye in the floaters can be timely medical treatment, under the guidance of the doctor for treatment.