”Black shadow in front of the eyes” is a clinical symptom of ophthalmic diseases, divided into “floating black shadow with the rotation of the eye” and “fixed black shadow that does not rotate with the eye”. They are seen in the following diseases: 1, the floating black shadow: common in the vitreous liquefaction, clouding caused by “flying mosquitoes”, this floating small black shadow, especially when looking at the white bright background more obvious, can also be accompanied by a sense of flash, no special treatment. There are also relatively large floating black shadow, may be vitreous hemorrhage, anterior chamber hemorrhage, need to be found through special ophthalmic examination, if the bleeding is not large and does not affect the key parts, drug therapy to promote blood absorption, if long-term malabsorption, surgical treatment. 2, fixed black shadow: common in retinal fissure, retinal detachment, once this situation occurs, need immediate surgery to close the fissure, reset the retina. In addition, fixed black shadows can also be seen in corneal clouding, corneal foreign bodies, etc. Diseases of the optic nerve and central nervous system can also cause black shadows in front of the eyes, which are often quadrantally distributed (nasal, temporal hemianopia, etc.) Therefore, “black shadows in front of the eyes” can be seen in a variety of ophthalmic diseases and should be differentiated according to the nature of the specific black shadow.