| 单词 |
presbyopia |
| 释义 |
‖ presbyopia|prɛs-, prɛzbɪˈəʊpɪə|
Rarely in anglicized form ˈpresbyopy.
[mod.L., f. Gr. πρέσβυς an old man + -ωπία (as in ἀµβλυωπία amblyopia), f. ὤψ, ὠπ- eye.]
An affection of the eyes incident to old or advancing age, in which the power of accommodation to near objects is lost or impaired, and only distant objects are seen distinctly; a form of long-sightedness.
1793Young in Phil. Trans. LXXXIII. 178 The central part of the crystalline becomes rigid by age, and this is sufficient to account for presbyopia. 1822–34Good's Study Med. (ed. 4) III. 151 The third variety, or that produced by old age, constitutes the presbytia and presbyopia of medical writers. 1869G. Lawson Dis. Eye (1874) 233 Presbyopia or Long Sight is one of the first of the legion of troubles which advancing years bring upon all of us. 1881Le Conte Sight i. iii. 49 The remedy for presbyopy is the use of convex glasses. Ibid. 50 Myopy is a structural defect; presbyopy is a functional defect. |
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