Why does my eye doctor check my eye pressure?

When you visit your eye doctor, one of the routine tests performed is measuring your eye pressure. This might seem like a simple procedure, but it provides crucial information about your eye health. Let’s dive into why checking eye pressure is important and what it means for your overall vision.

What is Eye Pressure?

Eye pressure, also known as intraocular pressure (IOP), is the fluid pressure inside your eye. It helps maintain the eye’s shape and proper functioning. The normal range for eye pressure is between 10 and 21 mmHg (millimeters of mercury). Maintaining this pressure is vital for the health of the optic nerve, which transmits visual information from your eye to your brain.

Why Eye Pressure is Checked

1. Detecting Glaucoma: One of the primary reasons for measuring eye pressure is to check for glaucoma, a group of eye conditions that damage the optic nerve. Elevated eye pressure is a major risk factor for glaucoma, and early detection is crucial for preventing vision loss.
2. Monitoring Eye Health: Regular eye pressure checks help monitor the overall health of your eyes. Changes in eye pressure can indicate potential problems, allowing for timely intervention.
3. Assessing Treatment Efficacy: For patients already diagnosed with glaucoma or other eye conditions, regular eye pressure checks are essential to assess the effectiveness of treatment and make necessary adjustments.
4. Identifying Other Eye Conditions: Elevated or decreased eye pressure can also be indicative of other eye conditions, such as ocular hypertension or uveitis (inflammation of the middle layer of the eye).

How Eye Pressure is Measured

1. Tonometry: The most common method for measuring eye pressure is called tonometry. Several types of tonometry exist, including:
   • Goldmann Applanation Tonometry: This method involves numbing the eye with drops and gently pressing a small probe against the cornea to measure pressure.
   • Non-contact Tonometry (NCT): Also known as the “air puff” test, NCT measures eye pressure by releasing a quick puff of air onto the eye’s surface and calculating pressure based on the eye’s resistance to the air.
   • Tono-Pen: This handheld device touches the cornea lightly to measure eye pressure. It’s often used for patients who have difficulty with other methods.
2. Other Methods: In some cases, your eye doctor might use other methods, such as digital palpation, where they gently press on the eye with their fingers to estimate pressure, although this is less precise.

What Your Eye Pressure Reading Means

• Normal Range: An eye pressure reading between 10 and 21 mmHg is generally considered normal.
• High Eye Pressure (Ocular Hypertension): A reading above 21 mmHg indicates high eye pressure, which can be a risk factor for developing glaucoma.
• Low Eye Pressure: A reading below 10 mmHg is less common but can indicate other eye health issues, such as fluid leakage or a potential injury.

What Happens If Your Eye Pressure is Abnormal?

If your eye pressure is outside the normal range, your eye doctor will likely conduct additional tests to determine the underlying cause. These tests may include:

• Visual Field Test: To check for any vision loss.
• Optic Nerve Examination: Using imaging technology to assess the health of your optic nerve.
• Gonioscopy: To examine the drainage angle of the eye and see if it’s open or closed.

Regular eye pressure checks are a critical part of maintaining your eye health. They help detect and manage conditions like glaucoma early, ensuring you receive the best possible care. If you have concerns about your eye pressure or notice any changes in your vision, schedule an appointment with your eye doctor promptly.

Are you over 50? It may be time to schedule an eye exam. Call us at 801-658-5486 to schedule your eye exam.