Inability to discriminate visually presented objects despite normal vision following brain injury. The term was introduced, in 1890 by Heinrich Lissauer in his paper published in Archiv für Psychiatrie und Nervenkraknheiten.  It was derived by clinical observation.

Lissauer H. Ein Fall von Seelenblindheit  nebst einem Beitrage zur Theorie derselben.  Archiv für Psychiatrie und Nervenkrakheiten.1890; 21: 222-70.

Hector Warnes
March 3, 2016