A variety of colourless transparent rock crystal (quartz), formerly used instead of glass in spectacles; a lens made of this. Cf. compounds 1b. Obs…
| 单词 | θ16305 |
| 释义 | the world > health and disease > healing > ophthalmology or optometry > aids to defective vision > [noun] > spectacles > lens of spectacles > types of (5) pebble1688 A variety of colourless transparent rock crystal (quartz), formerly used instead of glass in spectacles; a lens made of this. Cf. compounds 1b. Obs… distance lens1907 As a modifier, designating lenses used to correct myopia, or spectacles with such lenses, as in distance glasses, distance lens, distance spectacles… omnifocal1962 (a) adj. designating a lens whose power changes continuously from top to bottom (cf. varifocal, adj. b); (b) n. an omnifocal lens. toric1962 Of or pertaining to a torus (see torus, n. 4); having the form of a torus or a portion of one; spec. in Ophthalmology, applied to a lens with one… varifocal1975 Ophthalmology. = omnifocal adj. n. at omni-, comb._form affix. Also elliptical. |
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