| 单词 | photopic |
| 释义 | photopic, a. Physiol.|fəʊˈtɒpɪk, fəʊˈtəʊpɪk|
[f. photo- 1 + -opia + -ic.]
Of or pertaining to vision in levels of illumination similar to daylight, believed to involve chiefly the cones of the retina.
1915J. H. Parsons Introd. Study of 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. 1921Phil. Mag. XLI. 298 The entire luminosity curve of photopic vision will be shifted towards the red end of the spectrum. Ibid., The photopic luminosity curve does not quite coincide with the scotopic luminosity curve. 1960Electronic Engin. XXXII. 145/1 For the comparison of camera versus visual estimates of relative luminance, it is convenient to have inscribed on the graticule to photopic curve. 1965J. E. Crouch Functional Human Anat. xix. 597/1 The cones are photopic or discriminative and enable us to see details of form, structure, and color. 1975J. P. Thomas in Carterette & Friedman Handbk. Perception V. vii. 238 At photopic levels of illumination, acuity is highest when the target is viewed with the center of the fovea and decreases rapidly as the image of the target is displaced toward the periphery. |
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