photopian.
/fəʊˈtɒpɪə/, /fəʊˈtəʊpɪə/, U.S. /fəˈtoʊpiə/, /ˌfoʊˈtoʊpiə/ Physiology. Now rare.
Vision in conditions of bright light; light-adapted vision; photopic vision. Cf. scotopia n.
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the world > physical sensation > sight and vision > [noun] > light adaptation
adaptation1839
light adaptation1897
photopia1915
1915 J. H. Parsons Introd. Study Colour Vision ii. 17 If the eye has been exposed to bright light it is said to be light-adapted. I shall speak of vision under these circumstances as photopia, and the light-adapted eye as a photopic eye.
1960 Science 12 Feb. 417/3 The ‘special wavelength effects’ of the tremendous difference in adaptation levels between threshold and photopia are by no means yet fully known.
1969 Vision Res. 9 1259 Illumination levels drop below photopia.
This is a new entry (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1915