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  2. Intraocular pressure - Wikipedia

    en.wikipedia.org/wiki/Intraocular_pressure

    Ocular hypertension (OHT) is defined by intraocular pressure being higher than normal, in the absence of optic nerve damage or visual field loss. [ 13 ] [ 14 ] Ocular hypotension, hypotony, or ocular hypotony , is typically defined as intraocular pressure equal to or less than 5 mmHg.

  3. 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 ...

  4. Intraocular lens power calculation - Wikipedia

    en.wikipedia.org/wiki/Intraocular_lens_power...

    Through normal eyes an average velocity of 1555 m/s is accepted for calculation. Modern instruments use separate sound velocities for the different eye components to obtain the total axial length. The measured transit time is converted to a distance using the formula d=t/v Where d is the distance, t is the time and v is the velocity. [1]

  5. 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]

  6. Trabectome - Wikipedia

    en.wikipedia.org/wiki/Trabectome

    The Goldmann equation states that Intraocular Pressure = [Aqueous Humor Formation/Outflow] + Episcleral Venous Pressure. This equation states that free-flowing aqueous humor should cause intraocular pressure to drop to the same level as in the episcleral veins [26]. However, this is rare, and the average postoperative intraocular pressure is ...

  7. Ocular hypertension - Wikipedia

    en.wikipedia.org/wiki/Ocular_hypertension

    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. [4] [5] Elevated intraocular pressure is an important risk factor and symptom of glaucoma. Accordingly, most individuals with consistently ...

  8. List of optometric abbreviations - Wikipedia

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

    Family ocular history F/U: Follow up appointment GH: General health G(M)P: General (medical) practitioner HA: Headaches HARC: Harmonious abnormal retinal correspondence HM: Hand motion vision – state distance Hx: History IOL: Intra-ocular lens IOP: Intra-ocular pressure ISNT: Inferior, Superior, Nasal, Temporal rule used to assess optic disc ...

  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.