If organic or physical diseases are ruled out, blackness in front of the eyes may be caused by psychiatric factors, commonly seen in anxiety disorders, depression, phobias and other neurotic disorders, as well as neurasthenia and hysteria, and severe mental disorders may also be accompanied by such physical symptoms. It may be because the patient has been fidgeting or in a position for a long time, such as sitting still, and jerking up, the movement may be faster, but the patient is not aware of it, often causing a delay in blood supply, and there may be a blackness in front of the eyes. Patients in this situation may fall and not be able to maintain this body balance, so they must get up slowly and be sure to give their bodies some support to prevent falls.