| 释义 |
cornea Anat.|ˈkɔːniːə|
[L. cornea short for med.L. cornea tēla horny web or tissue, later cornea tunica horny coating, f. L. corneus corneous.]
The transparent convexo-concave portion of the anterior covering of the eyeball, so called from its horny consistence.
Also called lucid cornea or proper cornea, as distinguished from the opaque cornea or sclerotic coat.
[1398Trevisa Barth. De P.R. v. v. (1495) 108 Of the four webbes in the formest partyes of the eye the fyrste hyghte tela arena..the thirde Cornea, horny.] 1527Andrew Brunswyke's Distyll. Waters P ij b, The moystenes which is in cornea of the iyen. 1633P. Fletcher Purple Isl. v. 54 note, The second is cornea or hornie tunicle. 1664Power Exp. Philos. i. 1 The diaphanous Cornea [of the Flea's eye]. 1799Med. Jrnl. I. 332 An Instrument for cutting the Cornea, in the Operation of extracting a Cataract. 1840G. Ellis Anat. 104 On the inner or concave surface of the proper cornea is a thin elastic membrane—the ‘elastic cornea’. 1872Huxley Phys. ix. 226 In front..the fibrous capsule of the eye..becomes transparent, and receives the name of the cornea.
b. conical cornea: a conical projection of the cornea.
1854W. Mackenzie Dis. Eye (ed. 4) 686 It is generally the case that objects appear multiplied to an eye affected with conical cornea. 1874G. Lawson Dis. Eye (ed. 2) 48 Conical cornea is a staphylomatous bulging of the middle portion of the cornea, caused by a thinning of that structure in the central region. |