unstructured photopsia
   Also known as phosphene. Both terms are used to denote a type of *photopsia (i.e. a 'flash of light') consisting of an unformed shape. The term unstructured photopsia is used in opposition to * structured photopsia. Pathophysiologically, the mediation of unstructured photopsia has historically been associated primarily with aberrant neu-rophysiological activity in the retina and other peripheral parts of the visual system, although theoretically any part of the visual system may be involved in their mediation.
   References
   Amos, J.F. (1999). Differential diagnosis of common etiologies of photopsia. Journal of the American Optometric Association, 70, 485-504.

Dictionary of Hallucinations. . 2010.

Look at other dictionaries:

  • photopsia —    Also known as photome, phosphorescence of the retina, scintillations, and suffusio scintillans. The term photopsia comes from the Greek words photizein (to give light, to illuminate) and opsis (seeing). It is used to denote a group of * simple …   Dictionary of Hallucinations

  • structured photopsia —    A term used to denote a type of * photopsia (i.e. light flashes) depicting geometric patterns such as circles, squares, hexagonal shapes, etc. The term structured photopsia is used in opposition to *unstructured photopsia and *phosphene. Patho …   Dictionary of Hallucinations

  • phosphene —    Also known as unstructured photopsia. The term phosphene comes from the Greek words phos (light) and phainein (to shine). It is used to denote a transient flash or spark of light, commonly referred to as seeing stars . Phosphenes are * visual… …   Dictionary of Hallucinations

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”