Preparing for eye pressure

Overview

Eye pressure, also called intraocular pressure (IOP), is a measure of the fluid pressure inside your eye. A normal eye pressure ranges from about 10 to 21 mmHg. High eye pressure can sometimes damage the optic nerve, which may lead to glaucoma. Preparing for an eye pressure test means knowing what to expect so the results are accurate.

Yes, eye pressure checks are very common during routine eye exams, especially for adults over 40. High eye pressure (ocular hypertension) affects about 4% to 7% of adults worldwide.

Anyone can have high eye pressure, but it becomes more common with age. People with a family history of glaucoma, those of African or Hispanic descent, and people with diabetes or high blood pressure have a higher risk.

Symptoms

Causes

Main causes

• Too much fluid (aqueous humor) being produced inside the eye
• The drainage channels in the eye not working well, causing fluid to build up
• Certain medications, such as steroids, can raise eye pressure
• Eye injury or inflammation can also affect pressure

Risk factors

• Age over 40

When to see a doctor

See a doctor urgently if:

• Any sudden eye pain, redness, or vision change should be seen immediately.

Book a routine appointment if:

• Adults over 40 should have an eye exam every 1 to 2 years, including an eye pressure check.
• If you have risk factors, you may need yearly checks starting at a younger age.

Diagnosis

Eye pressure is measured during a comprehensive eye exam. The doctor will also examine your optic nerve and check your vision field to see if any damage has occurred.

Tests that may be done

• Tonometry: A device gently touches the front of your eye (after numbing drops) to measure pressure.
• Ophthalmoscopy: The doctor looks at the back of your eye using a special lens.
• Perimetry: A visual field test to check for blind spots.
• Pachymetry: Measures the thickness of your cornea, which can affect pressure readings.

What to expect at your appointment

The test is quick and painless. First, numbing drops are placed in your eyes. Then a small device (or a puff of air) measures the pressure. You may see a blue light. The whole exam takes about 15 minutes. You might feel a slight sting from the numbing drops, but it passes quickly.

Treatment

If your eye pressure is high and there is risk of damage, the goal is to lower it to a safe level. Treatment is usually lifelong but can preserve your vision.

Self-care at home

• Take any prescribed eye drops exactly as your doctor tells you.
• Attend all follow-up appointments to monitor pressure.
• Tell your doctor about any other medications you take, including over-the-counter products.

Medical treatments

The most common treatment is medicated eye drops that either reduce the amount of fluid the eye makes or improve drainage. Your doctor may also recommend laser treatment (like selective laser trabeculoplasty) to help fluid drain more easily. In some cases, oral medications can be used, but these are less common.

When is surgery considered?

If drops and laser are not enough, surgery (such as trabeculectomy) can create a new drainage channel to lower pressure. Your doctor will discuss if this is right for you.

Living with this condition

Living with high eye pressure or glaucoma usually does not change your daily activities much. You may need to use eye drops daily and visit your eye doctor regularly. If vision loss occurs, low vision aids and support can help.

Lifestyle tips

• Protect your eyes from injury by wearing safety glasses during sports or work.
• Avoid activities that raise eye pressure, such as heavy weightlifting or head-down yoga poses (check with your doctor).
• Manage stress as it can affect eye pressure.

Diet and exercise

A healthy diet rich in fruits and vegetables, especially dark leafy greens, may support eye health. Regular moderate exercise, like walking, can help lower eye pressure. Avoid extreme physical strain.

Mental health and emotional wellbeing

Learning you have high eye pressure or glaucoma can be worrying. It's normal to feel anxious about vision loss. Talk to your doctor and share your concerns. Most people with glaucoma maintain good vision for life with proper care.

Prevention

High eye pressure cannot always be prevented, but you can reduce the risk of vision loss by having regular eye exams and catching it early. Treating high pressure when needed can prevent or slow damage to the optic nerve.

Screening programmes

Routine eye exams are the best screening tool. If you have risk factors, talk with your doctor about how often you should be screened.

Complications

If left untreated

• Damage to the optic nerve can lead to glaucoma.
• Gradual loss of peripheral (side) vision.
• Blindness if the condition progresses without treatment.

Long-term outlook

With early detection and proper treatment, most people with high eye pressure or glaucoma can keep good vision for their whole lives. The condition is manageable, and vision loss can be prevented or slowed. Regular follow-up is key.

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