In tonometry, the flattening of the cornea by pressure. Intraocular pressure is directly proportional to external pressure, and inversely proportional to the area flattened. SEE ALSO: a. tonometer. [L. ad, toward, + planum, plane]

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ap·pla·na·tion .ap-lə-'nā-shən n abnormal flattening of a convex surface (as of the cornea of the eye)

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a method of flattening the cornea that is used to determine the intraocular pressure in applanation tonometry (see tonometer).

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ap·pla·na·tion (ap″lə-naґshən) [L. applanatio] undue flatness, as of the cornea.

Medical dictionary. 2011.

Look at other dictionaries:

  • applanation — n. a method of flattening the cornea that is used to determine the intraocular pressure in applanation tonometry (see tonometer) …   The new mediacal dictionary

  • Applanation — Ap|planatio̱n [zu ad... u. lat. planus = flach, eben] w; , en, in fachspr. Fügungen: Ap|plana̱tio, Mehrz.:̱|nes: Abflachung; im engeren Sinne: Ap|plana̱tio cọrneae: Abflachung der Hornhaut (angeboren oder Zeichen einer beginnenden… …   Das Wörterbuch medizinischer Fachausdrücke

  • Applanation — Ap|pla|na|ti|on* die; , en <zu ↑ad..., lat. planare »ebnen« (vgl. ↑applanieren) u. ↑...ation> Abflachung der Hornhaut des Auges (Med.) …   Das große Fremdwörterbuch

  • applanation tonometer — n an ophthalmologic instrument used to determine pressure within the eye by measuring the force necessary to flatten an area of the cornea with a small disk * * * an instrument that measures intraocular pressure by determination of the force… …   Medical dictionary

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  • tonometer — 1. An instrument for determining pressure or tension, especially an instrument for determining ocular tension. 2. A vessel for equilibrating a liquid ( e.g., blood) with a gas, usually at a controlled temperature; originally so named because it… …   Medical dictionary

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