Presbyopia Pres`by*o"pi*a[NL., from Gr. ? old, n., an old man + ?, ?, the eye.] (Med.) A defect of vision consequent upon advancing age. It is due to rigidity of the crystalline lens, which produces difficulty of accommodation and recession of the near point of vision, so that objects very near the eyes can not be seen distinctly without the use of convex glasses. Called also {presbytia}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.


Look at other dictionaries:

  • Presbyopia — is a condition where the eye exhibits a progressively diminished ability to focus on near objects with age. Presbyopia’s exact mechanisms are not known with certainty; the research evidence most strongly supports a loss of elasticity of the… …   Wikipedia

  • presbyopia — (n.) far sightedness brought on by age, 1793, Modern Latin, from Gk. presbys old man (see PRESBYTERIAN (Cf. Presbyterian)) + opia, from ops eye (see EYE (Cf. eye) (n.)) …   Etymology dictionary

  • presbyopia — [prez΄bē ō′pē ə, pres΄bē ō′pē ə] n. [ModL < Gr presbys, old (see PRIEST) + ōps, EYE] a form of farsightedness occurring after middle age, caused by a diminished elasticity of the crystalline lens presbyope [prez΄bēōp΄, pres΄bēōp΄] n.… …   English World dictionary

  • Presbyopia — The loss of the eye s ability to change focus to see near objects. The reasons for this loss of the power of accommodation are not yet fully known. It is conventionally said to be due to the lens becoming less elastic with time. Presbyopia is… …   Medical dictionary

  • presbyopia — noun Etymology: New Latin, from Greek presbys old man + New Latin opia Date: 1793 a visual condition which becomes apparent especially in middle age and in which loss of elasticity of the lens of the eye causes defective accommodation and… …   New Collegiate Dictionary

  • presbyopia — presbyopic /prez bee op ik, pres /, adj. /prez bee oh pee euh, pres /, n. Ophthalm. farsightedness due to ciliary muscle weakness and loss of elasticity in the crystalline lens. [1785 95; < Gk presby (comb. form of présbys old, old man) + OPIA] * …   Universalium

  • presbyopia — noun Inability of the eye, due to ageing, to focus on nearby objects. Ant: myopia …   Wiktionary

  • PRESBYOPIA —    diminution of sight due to age, occurring usually about forty five, when near objects are less distinctly seen than distant, an affliction due to the flattening of the lens …   The Nuttall Encyclopaedia

  • presbyopia — prezbɪ əʊpɪə n. far sightedness, loss of the ability to see nearby objects clearly (due to age) …   English contemporary dictionary

  • presbyopia — [ˌprɛzbɪ əʊpɪə] noun long sightedness caused by loss of elasticity of the lens of the eye. Derivatives presbyopic adjective Origin C18: mod. L., from Gk presbus old man + ōps, ōp eye …   English new terms dictionary

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