dichopticadj.
/dʌɪˈkɒptɪk/, /dᵻˈkɒptɪk/, U.S. /ˌdaɪˈkɑptɪk/, /dᵻˈkɑptɪk/ 1. Entomology. Of the eyes of certain dipteran flies: widely separated. Of a fly (or its head): having such eyes. Contrasted with holoptic adj. at holo- comb. form .
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1885 Entomologica Americana 1 115 Males holoptic or dichoptic.
1899 D. Sharp in Cambr. Nat. Hist. VI. 440 When the eyes of the two sides meet in a co-adapted line of union the Insect is said to be ‘holoptic’, and when the eyes are well separated ‘dichoptic’.
1949 H. Oldroyd Diptera I. 5 In many families [of Diptera] the males have the eyes approaching or meeting (holoptic) and the females have them well separated (dichoptic).
2003 Jrnl. Paleontol. 77 372/2 Eyes bare, large, occupying entire lateral surface of head, not dichoptic in male.
2. Physiology and Psychology. Relating to or involving the presentation of separate and independent (not merely stereoscopic) images to the two eyes. Cf. dichotic adj.
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1960 P. A. Kolers & B. S. Rosner in Amer. Jrnl. Psychol. 73 4 One may distinguish at least three modes of viewing: monocular, binocular, and a third which we shall call ‘dichoptic’. [Note] Consistency of usage would require that the first two be called ‘monoptic’ and ‘dioptic’ respectively.
1986 Vision Res. 26 1257 Wavelength discrimination was first tested under dichoptic viewing so that discrimination could, most likely, be performed by the visual cortex.
2007 P. D. Zelazo et al. Cambr. Handbk. Consciousness 719 Binocular rivalry results from dichoptic stimulation with incompatible images that cannot be fused into a meaningful percept.
Derivatives
diˈchoptically adv. Physiology and Psychology
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1968 Computers & Biomed. Res. 1 435 [The] flash and pattern mask were comparable in masking effect with monoptic presentation but the flash was almost ineffective dichoptically.
2002 R. D. Freeman in D. Alais & R. Blake Binocular Rivalry 776/1 Four examples of pairs of dissimilar images that, when viewed dichoptically, trigger binocular rivalry.
This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022).
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adj.1885