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What Is Normal Intraocular Pressure?

Intraocular eye pressure is a measurement of the fluid inside the eye. This fluid helps the eye maintain its round shape. Normal intraocular pressure is between 10 and 21 mmHg, according to MedRounds.org.

  1. Measuring Intraocular Pressure

    • Intraocular pressure is measured during a routine eye exam using a tool called a tonometer. Your eye doctor usually numbs your eyes with eye drops while a small probe rests against your eye surface. Another method is to send a puff of air onto the eye’s surface.

    Low Intraocular Pressure

    • Intraocular pressure lower than 5mmHg is considered abnormally low. This is known as hypotony. Hypotony can lead to problems such as discomfort and accelerated cataract formation, according to eMedicine.com.

    High Intraocular Pressure

    • High intraocular pressure is pressure greater than 21 mmHg. This is referred to as ocular hypertension. High IOP increases the risk for developing glaucoma, according to MedRounds.org.

    Considerations

    • Intraocular pressure can vary throughout the day. Caffeine, physical activity, stress and rapid fluid intake can cause fluctuation in intraocular pressure, according to VisionRx.com.

    Warning

    • Glaucoma is the leading cause of blindness in adults in the U.S. Early detection and treatment are imperative to help prevent loss of vision. Many eye problems don’t cause any symptoms, so be sure to see your eye doctor on a regular basis.

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