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Doctor insights on: Tonometry

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Tonometry (Overview)

Tonometry is the technique for measuring the internal pressure of the eye. It is done by ophthalmologists with a device called a goldmann tonometer which is the most accurate. Optoms use air puff and there are a few hand held devices. The measurement is used to detect glaucoma.


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What is the definition or description of: tonometry?

What is the definition or description of: tonometry?

Eye pressure measure: Tonometry is the technique for measuring the internal pressure of the eye. It is done by ophthalmologists with a device called a goldmann tonometer which is the most accurate. Optoms use air puff and there are a few hand held devices. The measurement is used to detect glaucoma. ...Read more

Tonometry (Overview)

Tonometry is the technique for measuring the internal pressure of the eye. It is done by ophthalmologists with a device called a goldmann tonometer which is the most accurate. Optoms use air puff and there are a few hand held devices. The measurement is used to detect glaucoma.


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My tonometry tests shows 22-25mm hg, does it mean I have glaucoma? Is there a pre-glaucoma?

My tonometry tests shows 22-25mm hg, does it mean I have glaucoma?  Is there a pre-glaucoma?

No: Ocular hypertension (glaucoma suspect), unless progressive damage to the optic nerve has occurred by the high pressure as measured over time by structural and functional change. ...Read more

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Like gonioscopy, opthalmoscopy, and tonometry hurt?

Like gonioscopy, opthalmoscopy, and tonometry hurt?

They Do not hurt: Gonioscopy, ophthalmoscopy and tonometry are all part of a complete eye examination and generally do not hurt. Topical anesthetic drops are instilled in the eye at the beginning of the examination. While the bright light of ophthalmoscopy may be briefly uncomfortable, it is generally not painful. ...Read more

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Can you use tonometry test to check for an astigmatism?

Can you use tonometry test to check for an astigmatism?

Tonometry=glaucoma: Tonometry checks the eye pressure looking for a disease called glaucoma (high pressure). To check: the eye is 'numbed' with drops and device attached to 'slit lamp' touches the cornea. Also a pencil-like device touches the eye and instantly records eye pressure. Another method 'uses a puff of air' . Astigmatism can be found on a standard eye exam/refraction test or 'astigmatism mirror chart'. ...Read more

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Could you use a 'tonometry test' to check for an astigmatism?

Could you use a 'tonometry test' to check for an astigmatism?

Astigmatism: Not usually. If you are in the field, you can look at the mires of tonometry to see if there is astigmatism, but there are better methods including refraction and topography that can be helpful in checking for astigmatism. ...Read more

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Do the tests like gonioscopy, opthalmoscopy, and tonometry hurt?

No: Those are very common tests done by ophthalmologist who are trained to perform them. When done correctly, there is no pain at all. The eyes are first numbed with an anesthetic eye drop and therefore, no pain is felt. During the tests, an instrument does come in contact with the cornea, but the patient cannot feel anything because the eye is numbed. Aprehension...Yes...Pain...No! ...Read more

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Can tests like gonioscopy, opthalmoscopy, and tonometry be painful?

No.: These eye tests are not painful but the bright lights may be intense. The tonometry may be startling (if it involves a puff of air) and if they have to contact your corneal, they will use topical anesthetic. ...Read more

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Is it possible to use a 'tonometry test' to check for an astigmatism?

No: A tonometry test determines the pressure in your eye. Astigmatism is most commonly determined with a refraction, the test to find your glasses prescription. ...Read more

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What is preferred for glaucoma testing--puff-air or applanation tonometry?

What is preferred for glaucoma testing--puff-air or applanation tonometry?

Usually applanation: Air puff was developed for optometrists when they wisely were not permitted to use eyedrops. Because their skill level is less, they still prefer to use the air puff as it is less tricky. But the airpuff is not as accurate - it is a good screening device. Applanation is the gold standard, more accurate and precise but requires much more skill to use. So it is a tool of the ophthalmologist. ...Read more

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Which is preffered for glaucoma testing--puff-air or applanation tonometry?

Which is preffered for glaucoma testing--puff-air or applanation tonometry?

The latter: Goldmann applanation tonometry is the gold standard. Non-contact tonometry (nct) is often used when contact methods are not indicated and is inherently less accurate due lid interference, poor alignment of the eye or dryness. ...Read more