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applanation tonometer

   Also found in: Dictionary/thesaurus, Acronyms, Encyclopedia, Wikipedia 0.02 sec.
tonometer /to·nom·e·ter/ (to-nom´ĕ-ter) an instrument for measuring tension or pressure, particularly intraocular pressure.
air-puff tonometer  an instrument for measuring intraocular pressure by sensing deflections of the cornea in reaction to a puff of pressurized air.
applanation tonometer  an instrument that measures intraocular pressure by determination of the force necessary to flatten a corneal surface of constant size.
impression tonometer , indentation tonometer an instrument that measures intraocular pressure by direct pressure on the eyeball.

applanation tonometer
n.
An instrument for determining intraocular tension by measuring the pressure required to flatten a small area of the cornea.

tonometer
an instrument for measuring tension or pressure, especially intraocular pressure.
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Principles of the tonometer. By permission from Guyton R, Hall JE, Textbook of Medical Physiology, Saunders, 2000

applanation tonometer
measures the force required to flatten or applanate an area of cornea. Includes the MacKay-Marg, Halberg, Dräger and Goldmann tonometers.
indentation tonometer
measures the pressure required to indent the cornea; includes the Schiotz and pneumatonograph.


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IOP was measured with the standard Goldmann applanation tonometer at the same time every morning.
30) In most studies, comparisons with the Goldmann applanation tonometer indicate that the noncontact tonometer is reliable within the normal IOP range.
Both he and Edelman prefer to use an applanation tonometer instead, which actually touches the eye to measure resistance and is considered more accurate as well as painless.
 
 
 
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