What Are Eye Pressure Tests? How Eye Pressure Tests Detect Glaucoma Explained
How is Eye Pressure Tested?
An eye pressure test, also known as tonometry, uses a special instrument called a tonometer to measure the pressure within your eye.
During an eye pressure test, your optometrist will put some eye drops in your eye which contain a small amount of numbing medicine (anaesthetic) and dye into the front of your eye. From here, they will then shine a light into your eye and gently touch the surface of it with a tonometer.
You may have previously had an eye pressure test using a puff of air, however, most optometrists now use a more accurate device which measures pressure by direct contact with the eye.
Can an Eye Test Detect High Blood Pressure?
Uncontrolled high blood pressure can show signs at the back of the eye such as burst blood vessels and gathering of fluid at the macula (the most sensitive part of the retina). It is not unusual for people to discover that they have high blood pressure after they have had an eye test and have been advised to get their blood pressure checked.
Your optometrist will observe the calibre of the blood vessels in the back of your eye during an eye test. Interestingly, blood pressure and eye pressure vary independently. High blood pressure is not usually a direct cause for high eye pressure.
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