- A term used to denote a type of*scotoma (i.e. an area of loss or impairment of vision) presenting as a black spot within the field of vision. The term positive scotoma is used in opposition to the term * negative scotoma, which refers to a type of sco-toma that tends to go unnoticed by the affected individual and is detected only upon examination of the visual field.ReferencesSacks, O. (1992). Migraine. Revised and expanded. New York, NY: Vintage Books.
Dictionary of Hallucinations. J.D. Blom. 2010.
Look at other dictionaries:
positive scotoma — a scotoma subjectively perceived as a black spot in the visual field, and of which the patient is aware … Medical dictionary
scotoma — 1. An isolated area of varying size and shape, within the visual field, in which vision is absent or depressed. 2. A blind spot in psychological awareness. [G. skotoma, vertigo, fr. skotos, darkness] absolute s. a s. in which there is no… … Medical dictionary
negative scotoma — The term negative scotoma is indebted to the Greek noun skotos (darkness). It is used in a general sense to denote an area or island of loss or impairment of vision (i.e. a * scotoma), surrounded by a field of normal or relatively well… … Dictionary of Hallucinations
Carl Friedrich Richard Förster — (November 15, 1825 July 7, 1902) was a German ophthalmologist who was born in the town of Lissa (today Leszno, Poland). He received his medical doctorate in 1849, and for most of his career was associated with the University of Breslau. Two of… … Wikipedia
Migraine — This article is about the disorder. For other uses, see Migraine (disambiguation). Migraine Classification and external resources The pain of a migraine headache can be debilitating. ICD 10 … Wikipedia
migraine aura — The term migraine comes from the Old English megrim, which is in turn indebted to the Greek noun hèmikranion (meaning half the skull). The introduction of the term hèmikranion is attributed to the classical physician Galen of Pergamum, born as … Dictionary of Hallucinations
delirium tremens — Also known as shaking delirium and Saunders Sutton syndrome. The term delirium comes from the Latin verb delirare, which means to go off the furrow, to derail. The adjective tremens is Latin for trembling or shaking. The expression delirium… … Dictionary of Hallucinations
escotoma positivo — Eng. Positive scotoma Escotoma que es percibido subjetivamente por el paciente … Diccionario de oftalmología
Cataract — For other uses, see Cataract (disambiguation). Cataract Classification and external resources Magnified view of cataract in human eye, seen on examination with a slit lamp using diffuse illumination … Wikipedia
Achromatopsia — Classification and external resources A person with complete achromatopsia would see only black, white and shades of grey. Additionally, the image would usually be blurry in brighter light (in the brightest light, effectively invisible) but would … Wikipedia