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  2. Intraocular pressure - Wikipedia

    en.wikipedia.org/wiki/Intraocular_pressure

    Measured values of intraocular pressure are influenced by corneal thickness and rigidity. [5] [6] As a result, some forms of refractive surgery (such as photorefractive keratectomy) can cause traditional intraocular pressure measurements to appear normal when in fact the pressure may be abnormally high. A newer transpalpebral and transscleral ...

  3. Ocular tonometry - Wikipedia

    en.wikipedia.org/wiki/Ocular_tonometry

    Tonometry is the procedure that eye care professionals perform to determine the intraocular pressure (IOP), the fluid pressure inside the eye. It is an important test in the evaluation of patients at risk from glaucoma. [1]

  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. Ocular hypertension - Wikipedia

    en.wikipedia.org/wiki/Ocular_hypertension

    For most individuals, the normal range of intraocular pressure is between 10 mmHg and 21 mmHg. [3] It is estimated that approximately 2-3% of people aged 52-89 years old have ocular hypertension of 25 mmHg and higher, and 3.5% of people 49 years and older have ocular hypertension of 21 mmHg and higher.

  6. Ocular hypotony - Wikipedia

    en.wikipedia.org/wiki/Ocular_hypotony

    Ocular hypotony is divided into statistical and clinical types. If intraocular pressure is low (less than 6.5 mm Hg) it is called statistical hypotony, and if the reduced IOP causes a decrease in vision, it is called clinical. [4]

  7. Normal tension glaucoma - Wikipedia

    en.wikipedia.org/wiki/Normal_tension_glaucoma

    Over many years, glaucoma has been defined by an intraocular pressure of more than 20 mm Hg. Incompatible with this (now obsolete) definition of glaucoma was the ever larger number of cases that have been reported in medical literature in the 1980s and 1990s who had the typical signs of glaucomatous damage, like optic nerve head excavation and thinning of the retinal nerve fiber layer, while ...

  8. List of optometric abbreviations - Wikipedia

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

    IOP: Intra-ocular pressure ISNT: Inferior, Superior, Nasal, Temporal ... Normal wearing time ... Visual acuity with eye chart at Near 15.7 inches (400 mm) and without ...

  9. 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.

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