Ocular tonometry
Ocular Tonometry
Ocular tonometry (/ɒk.jʊ.lər tɒ.nɒm.ɪ.tri/) is a diagnostic procedure used to measure the pressure inside the eye, which is referred to as intraocular pressure (IOP). This test is crucial in the evaluation of patients at risk of glaucoma, a group of eye diseases causing optic nerve damage that may lead to vision loss or blindness.
Etymology
The term "tonometry" is derived from the Greek words "tonos" meaning tension or pressure, and "metron" meaning measure. Thus, tonometry essentially translates to the measurement of tension or pressure.
Procedure
Ocular tonometry is typically performed using a device called a tonometer. The most common type of tonometer is the Goldmann applanation tonometer, which flattens a small area of the cornea with a known force and measures the amount of force needed to flatten this area. Other types of tonometers include the non-contact (air puff) tonometer and the Tono-Pen.
Related Terms
- Intraocular Pressure (IOP): The pressure inside the eye.
- Glaucoma: A condition that causes damage to the eye's optic nerve and can result in vision loss and blindness.
- Tonometer: A device used to measure intraocular pressure.
- Goldmann Applanation Tonometer: A type of tonometer that is considered the standard method for measuring intraocular pressure.
- Non-contact Tonometer: A type of tonometer that measures intraocular pressure using a rapid air pulse.
- Tono-Pen: A handheld tonometer used to measure intraocular pressure.
External links
- Medical encyclopedia article on Ocular tonometry
- Wikipedia's article - Ocular tonometry
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