An eye pressure test measures the pressure inside your eye, called intraocular pressure. It is an important part of glaucoma assessment, but one reading alone cannot confirm or rule out glaucoma. A complete evaluation also looks at the optic nerve, drainage angle, visual field and nerve fibre layer.
What does an eye pressure test measure?
An eye pressure test measures intraocular pressure, the pressure within the eye. The clinical test used to measure this is called tonometry.
Eye pressure is one part of assessing glaucoma. Glaucoma is a group of conditions where the optic nerve becomes damaged. It is commonly called kala motia in Punjabi and Hindi.
Raised eye pressure is often associated with glaucoma, but not every person with glaucoma has raised pressure. Similarly, a raised pressure reading does not automatically mean you have glaucoma.
This is why an intraocular pressure test should be considered as part of a wider eye examination rather than a standalone diagnosis.
Why is an eye pressure test important for glaucoma?
The commonest form, primary open angle glaucoma, usually causes no pain or early symptoms. Peripheral vision is often affected first, and you may not notice the change until the disease is advanced.
Vision lost to glaucoma cannot be recovered. Treatment focuses on protecting the vision that remains. This makes regular eye testing important, particularly if you have known risk factors.
Your risk is higher with:
- Increasing age
- A family history of glaucoma
- High refractive error
- Previous eye injury
- Long term steroid use
- Diabetes
An eye pressure test can identify the pressure inside your eye, but the result needs to be considered alongside other findings.
If you are also concerned about changing spectacle power, you can read about the signs you need glasses.
What happens during an eye pressure test?
An eye pressure test is one part of a broader glaucoma assessment. Your ophthalmologist, a medical doctor specialising in eye care, will consider your pressure reading with other examination findings.
The glaucoma assessment
Diagnosis typically involves:
- Measuring intraocular pressure with an eye pressure test.
- Examining the optic nerve, which carries visual information from the eye to the brain.
- Gonioscopy, which assesses the drainage angle of the eye.
- Visual field testing, which checks your field of vision.
- Optical coherence tomography, which assesses the nerve fibre layer.
These tests provide different information. Together, they give a more complete picture of your eye health.
A single normal pressure reading does not rule out glaucoma. A raised reading does not confirm it. The assessment is based on the whole examination.
Who should have an eye pressure test?
Regular eye examinations are useful even when your vision seems normal.
Adults without symptoms or risk factors are generally advised to have a comprehensive eye examination every one to two years. From age 40, examinations are advised more often because the risk of glaucoma and other conditions rises.
If glaucoma runs in your family, regular examinations should begin at an earlier age.
People with diabetes need a dilated retinal examination at least once a year, even when their vision appears normal.
A comprehensive examination assesses more than spectacle power. It includes visual acuity, refraction, examination of the front of the eye, intraocular pressure and, where indicated, a dilated retinal examination.
This means an eye pressure test can form part of routine eye care, even if you do not currently have symptoms.
What happens if eye pressure is raised?
A raised reading does not confirm glaucoma. Your ophthalmologist considers the pressure alongside the optic nerve, drainage angle, visual field and nerve fibre layer.
If glaucoma is diagnosed, treatment options include:
- Pressure lowering eye drops
- Laser procedures such as trabeculoplasty or iridotomy
- Surgery when drops and laser are not sufficient
The aim of treatment is to protect the vision that remains.
For glaucoma care, you can learn more about Dr. Neetu Negi, Consultant Ophthalmologist and Glaucoma Specialist at Thind Eye Hospital.
Dr. Neetu Negi consults at the Jalandhar branch from Monday to Thursday and at the Hoshiarpur branch on Friday.
When is eye pressure an emergency?
Not every change in eye pressure causes noticeable symptoms. However, angle closure glaucoma can present suddenly with severe eye pain, redness, headache, nausea and haloes around lights.
This is an emergency and requires immediate medical attention.
Do not rely on symptoms alone to assess your glaucoma risk. Primary open angle glaucoma usually causes no pain or early symptoms, which is why routine testing matters.
The American Academy of Ophthalmology also provides patient information on eye health and glaucoma.
Book an eye pressure test
If you have not had a recent comprehensive examination, an eye pressure test can be one part of checking your eye health.
It is especially relevant if you have a family history of glaucoma, diabetes, increasing age, high refractive error, previous eye injury or long term steroid use.
If you are concerned about glaucoma or need a comprehensive eye examination, you can book an appointment with Thind Eye Hospital.
An eye pressure test is useful, but glaucoma assessment involves more than pressure alone. A complete examination helps your ophthalmologist assess the optic nerve, drainage angle, visual field and nerve fibre layer.
“This article provides general information about eye health and eye care services. It is not medical advice and does not replace a consultation with a qualified ophthalmologist. Symptoms vary between individuals. Please consult a licensed eye specialist before acting on any information here.”
