What is intraocular pressure?

The article was professionally consulted with Specialist Doctor I Nguyen Thi Bich Nhi - Ophthalmologist - General Surgery Department - Vinmec Nha Trang International General Hospital.
Normal intraocular pressure helps support the shape of the eye and helps the eye see. High or low intraocular pressure can seriously affect the eye. Therefore, you should check eye pressure to detect disease early for treatment.

1. What is intraocular pressure?

Intraocular pressure can vary throughout the day and varies from person to person. In healthy eyes, fluid drains freely for the purpose of keeping eye pressure stable. Intraocular pressure is divided into 3 categories:
Normal intraocular pressure helps support the shape of the eye and helps the eye see. High intraocular pressure: Also known as ocular hypertension. It can lead to glaucoma, blindness. Therefore, you should check for high eye pressure to help detect the disease earlier. If you have an eye injury or illness, taking medications such as steroids can cause your eye pressure to rise. Low intraocular pressure: May cause blurred vision. When the pressure is less than 5 mmHG, it is called ocular hypotension. It makes you more prone to a number of eye problems such as cataracts, macular damage, eye discomfort, etc.

2. When to measure intraocular pressure?

If you have any of the following signs and symptoms, you may need to measure your intraocular pressure:
Gradual loss of peripheral vision, usually in both eyes.
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Loss of vision in severe episodes; Severe eye pain. Nausea and vomiting are accompanied by severe eye pain. Sudden onset of visual disturbances, often in low light. Blurred vision, halos around lights. Red eyes.

3. Methods of measuring intraocular pressure

Tonometry is a technique that measures the pressure inside the eye. Measurement of intraocular pressure shows how solid your eyeball is in the same units of measurement. The normal range for intraocular pressure is about 10-20mmHG. Methods of measuring intraocular pressure include:
Measurement of intraocular pressure by recording the pressure tolerance of the cornea: This method uses eye drops to numb the surface of the eye. Contact ophthalmometry: Using a small probe gently pressed against the cornea to measure pressure in the eye. Next, use a microscope to look into your eyes. Measuring intraocular pressure with an electronic keratometry: Your doctor will gently place the rounded end of a pen-like tool over your cornea. Intraocular pressure results are displayed on the small computer control panel. Non-contact tonometry: This is a simple method to check for raised intraocular pressure and is a method of measuring intraocular pressure that does not use numbing eye drops. The label meter does not touch your eye because it uses the air to flatten your cornea.
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