Haidinger's brushes

Haidinger's brushes
Hai·ding·er's brush·es 'hī-diŋ-ərz-'brəsh-əz n pl a faint blue and yellow dumbbell-shaped image that is produced in the human eye by the selective absorption of polarized light by the yellow macular pigment of the fovea and can be used to detect polarized light without special equipment
Haidinger Wilhelm Karl von (1795-1871)
Austrian mineralogist. Haidinger is known for his pioneering studies in crystallography, in particular the absorption of light in crystals. In 1848 he designed an instrument with which he made observations of pleochroic minerals, with both transmitted and reflected light. His observations on the connection between absorption and the direction of polarization of transmitted and reflected light led him to develop the theory that a greater absorption (of the whole spectrum of visible light) corresponds to a higher index of refraction. He also discovered the phenomenon which enables the detection of polarized light without instruments.

Medical dictionary. 2011.

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  • Haidinger's brushes —    see Haidinger s brush …   Dictionary of Hallucinations

  • Haidinger's brush —    Also known as Haidinger brushes, Haidinger s brushes, and Haidinger s polarization brushes. All four eponyms refer to the Austrian physicist, geologist, and mineralogist Wilhelm Karl Ritter von Haidinger (1795 1871), who has been credited with …   Dictionary of Hallucinations

  • Haidinger's brush — is an entoptic phenomenon first described by Austrianphysicist Wilhelm Karl von Haidinger in 1844.Many people are able to perceive polarization of light.It may be seen as a yellowish horizontal bar or bow tie shape (with fuzzy ends, hence the… …   Wikipedia

  • Haidinger brushes — Hai·ding·er brushes (hiґding ər) [Wilhelm von Haidinger, Austrian mineralogist, 1795–1871] see under brush …   Medical dictionary

  • Haidinger brushes —    see Haidinger s brush …   Dictionary of Hallucinations

  • Haidinger's polarization brushes —    see Haidinger s brush …   Dictionary of Hallucinations

  • Haidinger — Wilhelm von, Austrian mineralogist, 1795–1871. See H. brushes, under brush …   Medical dictionary

  • Phenomene entoptique — Phénomène entoptique Les phénomènes entoptiques sont des effets visuels dont la source est dans l’œil lui même. Sommaire 1 Définition et histoire 2 Exemples de phénomènes entoptiques 2.1 Phénomène pseudo entoptique …   Wikipédia en Français

  • Phénomène entoptique — Les phénomènes entoptiques sont des effets visuels dont la source est dans l’œil lui même. Sommaire 1 Définition et histoire 2 Exemples de phénomènes entoptiques 2.1 Phénomène pseudo entoptique …   Wikipédia en Français

  • Phénomènes entoptiques — Phénomène entoptique Les phénomènes entoptiques sont des effets visuels dont la source est dans l’œil lui même. Sommaire 1 Définition et histoire 2 Exemples de phénomènes entoptiques 2.1 Phénomène pseudo entoptique …   Wikipédia en Français

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