The term morphopsia comes from the Greek words morphè (form) and opsis (seeing). It is used in a restricted sense to denote a multicoloured *complex visual hallucination with *microptic or * macroptic aspects. Pathophysiologically, this type of hallucination has historically been associated with lesions affecting the visual pathways of the temporal lobe. In a broader sense, the term morphopsia is used as a synonym for *formed visual hallucination. In the latter sense, it is used in opposition to the term * photopsia.
References
Lhermitte, J. (1959). Les hallucinations dans leurs relations avec les lésions du lobe occipital. Paris: Masson et Cie., Éditeurs.
Dictionary of Hallucinations. J.D. Blom. 2010.