Tonometry

What is this procedure for tonometry?

Tonometry helps in the early detection and treatment of glaucoma, the most common cause of irreversible blindness. It usually recognises abnormal levels of IOP, providing a guide for vision-threatening treatment recommendations.

Who should do this?

Tonometry is generally suggested mainly for those people who are likely to have a family history of glaucoma or those aged over 40 years and some conditions like diabetes or are symptomatic, such as when they experience eye pain, blurred vision, or halos around lights. Also, most routine eye exams incorporate this test in a complete evaluation of eye health.

How is it done?

Tonometry can be done by a number of techniques, including:-

• Applanation Tonometry – A small, flat-tipped probe touches the cornea to measure IOP.
• Non-Contact Tonometry (NCT) – Also known as the “air puff test,” this method involves a rapid air burst for determining eye pressure.
• Indentation Tonometry – This applies pressure by indenting the cornea using a gushing device that looks like a plunger.
• Dynamic Contour Tonometry (DCT) – Measuring IOP without flattening the cornea with a contour-matched sensor.

Is the procedure painful?

No, tonometry is painless. If it involves a contact on the cornea, anaesthetic eye drops are instilled for comfort.

What preparation is required?

There is no need for specific preparation about it. And the patient has to inform the doctor about his/her medications being consumed and any of the eye conditions if he/she is having. Some patients who wear contact lenses may have to remove them prior to taking the test.

How long does it take to do tonometry?

Tonometry itself is quite quick: each eye is measured in less than 10 minutes.

What are the benefits of tonometry?

• Early Detection: High IOP levels, a significant risk factor for developing glaucoma, can be identified early, and timely action can be taken.
• Non-Invasive Options – Techniques like non-contact tonometry are able to deliver accurate results without the associated discomfort linked with physical contact.
• Routine Monitoring – Tonometry results are important to continuous care: Some patients with glaucoma and others with an alteration in eye pressure benefit from tonometry.

Are there any associated risks attached to this type of procedure?

The following are considered minor risk factors concerning this procedure. It is often safe to say that some patients may experience:

• Temporary Discomfort – Mild irritation or watery eyes after contact-based methods.
• Infection Risk – Extremely rare; usually avoided with proper hygiene during the test.
• Allergic Reaction – Sensitivity to anaesthetic drops is rare but possible.

Can tonometry give false readings?

Yes, the fact that the cornea is thinner or thicker, technique, or patient always affects its accuracy, although newly advanced methods of tonometry such as DCT aim to minimise such errors.

Is there any recovery time while doing the tonometry?

No recovery time is needed; the patient can pursue everyday life at once after the process. If anaesthetic drops were instilled, refraining from rubbing the eyes for several hours to avoid irritation is advisable.

What happens after that?

The doctor relays the information to the patient, and, if IOP is reportedly normal (that is, between 10-21 mmHg), no immediate action may be taken. But elevated or low cases may warrant further testing, follow-up, and treatment considerations.

What are the next steps if abnormal IOP is detected?

If high IOP is detected, additional tests, such as visual field testing, optical coherence tomography (OCT), or gonioscopy, may be performed to confirm a glaucoma diagnosis. Based on the findings, treatment options such as medications, laser therapy, or surgery may be discussed.

How often should one undergo tonometry?

For individuals over 40 or those with risk factors like a family history of glaucoma, annual tonometry tests are recommended. Patients already diagnosed with glaucoma or ocular hypertension may need more frequent monitoring.

Conclusion

Tonometry is a cornerstone procedure in ophthalmology, offering a simple yet effective way to monitor and manage intraocular pressure. At Tender Palm Eye Hospital, our state-of-the-art equipment and skilled ophthalmologists ensure precise measurements and comprehensive care. Whether it’s part of a routine eye check-up or targeted glaucoma management, tonometry provides invaluable insights into your eye health.

Early detection of abnormal IOP can make all the difference in preserving vision and maintaining quality of life. By choosing Tender Palm Eye Hospital, you entrust your vision to a team dedicated to personalised care, accuracy, and patient comfort. Regular tonometry tests are a vital step in safeguarding your eyesight, empowering you to face the future with clarity and confidence.

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