Black floaters in the eyes can be seen in vitreous disease or retinal disease, such as vitreous opacities, retinal fissures or retinal detachment. Therefore, when this symptom occurs, a detailed fundus examination should be performed at the hospital to clarify the exact cause. In the case of physiological vitreous clouding, this is a very normal phenomenon, usually seen in highly myopic or middle-aged and elderly people, and is a degenerative disease that does not affect vision and does not require treatment. If there is pathological disease, such as vitreous hemorrhage, retinal fissures, or retinal detachment, aggressive treatment is required. Retinal fissures can be closed by retinal laser photocoagulation; retinal detachment requires retinal detachment repositioning surgery, which is the only way to prevent further aggravation of the disease.