tritanopia Ophthalm.
(traɪtəˈnəʊpɪə)
[mod.L., ad. G. tritanopie (J. von Kries 1911, in Helmholtz's Handbuch der Physiol. Optik (ed. 3) II. 341), f. trit-, var. trito- + an- 10 + -opia.]
A form of dichromatic colour-blindness marked by reduced sensitivity and discrimination in the blue and green parts of the spectrum. Hence ˈtritanope, one who has tritanopia; tritaˈnopic a.
| 1915 J. H. Parsons Introd. Study Colour Vision ii. i. 159, I shall adopt his [sc. v. Kries's] terms, viz., protanopes, deuteranopes, and tritanopes, corresponding respectively with v. Helmholtz' red-, green-, and blue-blind. Ibid. ii. 180 Cases of tritanopia or so-called blue-blindness are rare and mostly due to disease. Ibid. 304/1 (Index), Tritanopic vision. 1937 [see deuteranope]. 1955 Jrnl. Optical Soc. Amer. XLV. 614/1 The tritanopic luminosity function..does not indicate any major shift in excitation peaks of the receptor substances. 1959 [see dichromat, dichromate n.2]. 1965 New Scientist 14 Oct. 134/3 Tritanopic defects are described as autosomal dominant while tritanomaly is considered to be more or less recessive sex-linked. 1974 Jrnl. Optical Soc. Amer. LXIV. 1246/1 The tritanope's targets were formed of checks of pale violet and yellow-green and were compared to a blank field of violet. 1978 Nature 23 Nov. 390/1 When the eye has been adapted to a bright yellow light, a marked loss of sensitivity to short-wavelength stimuli may be recorded immediately after the extinction of the adapting field. This phenomenon..was termed transient tritanopia by Mollon and Polden. |