Of an artificial lens: correcting astigmatism.
单词 | θ16294 |
释义 | the world > health and disease > healing > ophthalmology or optometry > aids to defective vision > [adjective] > types of spectacles > types of spectacle lens (6) astigmatic1881 Of an artificial lens: correcting astigmatism. toric1890 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… trifocal1921 Of a lens: having three parts with different focal lengths. Of spectacles: having such lenses. multifocal1928 Having or relating to several foci or a range of focal lengths. pebble-grained1943 (a) having a pattern produced by pebbling; (b) (of a lens or spectacles) having the appearance of pebble (sense 2b). omnifocal1962 (a) adj. designating a lens whose power changes continuously from top to bottom (cf. varifocal, adj. b); (b) n. an omnifocal lens. |
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