scotopian.
/skə(ʊ)ˈtəʊpɪə/, U.S. /skoʊˈtoʊpiə/, /skəˈtoʊpiə/ Physiology.
Vision in conditions of low light, spec. when the eye is adapted to such conditions; dark-adapted vision; night vision. Cf. photopia n.Such vision involves mainly the rods of the retina.
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the world > physical sensation > sight and vision > types of vision > [noun] > scotopia
dark adaptation1897
scotopia1915
twilight vision1921
1915 J. H. Parsons Introd. Study Colour Vision ii. 17 If the eye has been kept completely free from light for a considerable period it is said to be dark-adapted. I shall speak of vision under these circumstances as scotopia.
1942 Amer. Jrnl. Psychol. 55 427 Even aloft the pilot is in difficulties, because looking at a lighted instrument-board may spoil his scotopia for the outer darkness.
1989 Toxicology 57 133 The chosen doses [of vitamin A] were, however, much greater than the maximum permissible quantities that are used, e.g. for treating hypogonadism in alcoholics or impaired scotopia.
2007 G. Haegerstrom-Portnoy & M. W. Morgan in Rosenbloom & Morgan's Vision & Aging ii. 39/2 Mesopia and scotopia occur at higher levels of ambient illumination in older individuals.
This entry has been updated (OED Third Edition, June 2011; most recently modified version published online March 2022).
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n.1915