Photopic vision

Photopic vision

Photopic vision is the vision of the eye under well-lit conditions. In humans and many animals, photopic vision allows color perception, mediated by cone cells.

The human eye uses three types of cones to sense light in three respective bands of color. The biological pigments of the cones have maximum absorption values at wavelengths of about 420 nm (blue), 534 nm (Bluish-Green), resp. 564 nm (Yellowish-Green). Their sensitivity ranges overlap to provide vision throughout the visible spectrum. The maximum efficacy is 683 lumens/W at a wavelength of 555 nm (green). [cite book|url=http://books.google.com/books?id=CU7-2ZLGFpYC&pg=PA467&dq=683+luminous+efficacy&ei=n3yvR_mrCJGgygSI2-ydBg&ie=ISO-8859-1&sig=cn1Fw0s76sQo2H7BhMyhuzmEc8E#PPA467,M1| title=The Focal Encyclopedia of Photography|editor=Leslie D. Stroebel, Richard D. Zakia|publisher=Focal Press|first=J.|last=Pelz|isbn=0240514173|edition=3E|year=1993|page=467]

The human eye uses scotopic vision under low-light conditions, and mesopic vision in intermediate conditions.

ee also

*Candela
*Purkinje effect
*Photometry
*Photosensitive ganglion cell

References


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  • photopic vision — dieninis regėjimas statusas T sritis fizika atitikmenys: angl. day vision; photopic vision vok. photopisches Sehen, n; Tagessehen, n; Zapfensehen, n rus. дневное зрение, n pranc. vision diurne, f; vision photopique, f …   Fizikos terminų žodynas

  • photopic vision — noun normal vision in daylight; vision with sufficient illumination that the cones are active and hue is perceived • Syn: ↑daylight vision • Hypernyms: ↑sight, ↑vision, ↑visual sense, ↑visual modality • Hyponyms: ↑ …   Useful english dictionary

  • photopic vision — day v …   Medical dictionary

  • photopic — Pertaining to p. vision. * * * phot·opic fōt ō pik, äp ik adj relating to or being vision in bright light with light adapted eyes that is mediated by the cones of the retina * * * adj. relating to or describing conditions of bright illumination.… …   Medical dictionary

  • photopic — adj. relating to or describing conditions of bright illumination. For example, photopic vision is vision in bright light, in which the cones of the retina are responsible for visual sensation. Derivatives: photopia n …   The new mediacal dictionary

  • vision diurne — dieninis regėjimas statusas T sritis fizika atitikmenys: angl. day vision; photopic vision vok. photopisches Sehen, n; Tagessehen, n; Zapfensehen, n rus. дневное зрение, n pranc. vision diurne, f; vision photopique, f …   Fizikos terminų žodynas

  • vision photopique — dieninis regėjimas statusas T sritis fizika atitikmenys: angl. day vision; photopic vision vok. photopisches Sehen, n; Tagessehen, n; Zapfensehen, n rus. дневное зрение, n pranc. vision diurne, f; vision photopique, f …   Fizikos terminų žodynas

  • visión fotópica — Eng. Photopic vision Ver fotopía …   Diccionario de oftalmología

  • vision — The act of seeing. SEE ALSO: sight. [L. visio, fr. video, pp. visus, to see] achromatic v. SYN: achromatopsia. binocular v. v. with a single image, by both eyes simultaneously. blue v. SYN: cyanopsia. central v. v. stimulated by an object imaged… …   Medical dictionary

  • photopic — adjective Etymology: New Latin photopia, from phot + opia Date: 1915 relating to or being vision in bright light with light adapted eyes that is mediated by the cones of the retina …   New Collegiate Dictionary

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