Understanding Eye Pressure (Intraocular Pressure, IOP)
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| Intraocular Pressure, IOP |
Your eyes, just like the rest of your body, have a natural pressure that helps keep them healthy and working properly. This is called intraocular pressure (IOP), which refers to the fluid pressure inside the eye.
What Is a Normal Eye Pressure?
Normal eye pressure typically ranges between 10 and 21 millimeters of mercury (mmHg). This balance is maintained by a steady flow of fluid inside the eye, known as the aqueous humor, which continuously enters and drains out.
How Is Eye Pressure Measured?
During a routine eye exam, your eye doctor will measure IOP using a special test. This check is quick and painless, but very important for monitoring eye health.
When Eye Pressure Is Too High
If your eye pressure is consistently above 21 mmHg, it’s called ocular hypertension. While this doesn’t always cause vision problems right away, it does increase the risk of developing glaucoma, a serious eye condition that can damage the optic nerve.
Daily Fluctuations
Eye pressure isn’t always constant. It can change throughout the day, often being higher in the morning. That’s why regular monitoring is important if you’re at risk.
Why It Matters
Keeping eye pressure within the normal range is key to protecting your vision. Regular eye exams help catch problems early and reduce the risk of conditions like glaucoma.
Summary
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Definition: The fluid pressure within the eye, measured in millimeters of mercury (mmHg).
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Normal Range: 10–21 mmHg. Maintained by balanced production and drainage of aqueous humor.
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Assessment: Routinely measured during ophthalmic examinations.
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Clinical Considerations:
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Ocular Hypertension: IOP >21 mmHg; associated with increased risk of glaucoma.
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Diurnal Variation: IOP may fluctuate, often peaking in the morning hours.
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Significance: Maintaining IOP within normal limits is essential for preserving optic nerve integrity and preventing glaucomatous damage.
