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  2. Ocular tonometry - Wikipedia

    en.wikipedia.org/wiki/Ocular_tonometry

    The tonometer tip rests on the cornea with a constant appositional force of one gram. When the sensor is subjected to a change in pressure, the electrical resistance is altered and the tonometer's computer calculates a change in pressure according to the change in resistance. A complete measurement cycle requires about eight seconds of contact ...

  3. Intraocular pressure - Wikipedia

    en.wikipedia.org/wiki/Intraocular_pressure

    Intraocular pressure (IOP) is the fluid pressure inside the eye. Tonometry is the method eye care professionals use to determine this. IOP is an important aspect in the evaluation of patients at risk of glaucoma. [1] Most tonometers are calibrated to measure pressure in millimeters of mercury .

  4. Goldmann Applanation Tonometer - Wikipedia

    en.wikipedia.org/wiki/Goldmann_Applanation_Tonometer

    Theoretically, average corneal rigidity (taken as 520 μm for GAT) and the capillary attraction of the tear meniscus cancel each other out when the flattened area has the 3.06 mm diameter contact surface of the Goldmann prism, which is applied to the cornea using the Goldmann tonometer with a measurable amount of force from which the IOP is ...

  5. Imbert-Fick law - Wikipedia

    en.wikipedia.org/wiki/Imbert-Fick_law

    Armand Imbert (1850-1922) and Adolf Fick (1829-1901) both demonstrated, independently of each other, that in ocular tonometry the tension of the wall can be neutralized when the application of the tonometer produces a flat surface instead of a convex one, and the reading of the tonometer (P) then equals (T) the IOP," whence all forces cancel each other.

  6. Schiøtz tonometer - Wikipedia

    en.wikipedia.org/wiki/Schiøtz_tonometer

    Schiøtz tonometer is an indentation tonometer, used to measure the intraocular pressure (IOP) by measuring the depth produced on the surface of the cornea by a load of a known weight. The indentation of corneal surface is related to the IOP.

  7. Eye examination - Wikipedia

    en.wikipedia.org/wiki/Eye_examination

    Intraocular pressure (IOP) can be measured by tonometry devices. The eye can be thought of as an enclosed compartment through which there is a constant circulation of fluid that maintains its shape and internal pressure. Tonometry is a method of measuring this pressure using various instruments. The normal range is 10-21 mmHg.

  8. List of optometric abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_optometric...

    Intra-ocular lens IOP: Intra-ocular pressure ISNT: Inferior, Superior, Nasal, Temporal ... One drop gtt drops GSL General sales list Gutt/g Guttae (drops) Meds

  9. Gonioscopy - Wikipedia

    en.wikipedia.org/wiki/Gonioscopy

    Indentation gonioscopy: An extension of the above two concepts, indentation gonioscopy involves the applied pressure of the goniolens against the eye, acutely raising the intraocular pressure in the anterior chamber and subsequently opening up the iridocorneal angle mechanically, allowing a greater understanding of the nature of the anterior ...