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Eye pressure is the measurement of force exerted by the aqueous humor fluid inside the front of the eye. The drainage angle of the eye allows aqueous humour to drain from the eye depending on fluid production, so that the eye pressure is maintained.
High eye pressure occurs as a result of a build-up of aqueous humour fluid; this is either due to an imbalance in the rate at which the fluid is drained relative to the fluid produced, or due to a narrow or blocked drainage angle which restricts the drainage of the fluid.
A ‘normal’ or average eye pressure ranges from 10mmHg to 24mmHg. If eye pressure is higher than this range it is called ocular hypertension or high eye pressure; the pressure can compress the optic nerve over time and damage it. A low eye pressure (below 5mmHg) is a very rare condition; it is called hypotony and can be caused by eye trauma or as a result of eye surgery. Hypotony can lead to eye problems including corneal swelling and decreased vision.
Tonometry is the procedure used to test the eye pressure to determine whether it is within the expected range or outside of its normal range. There are two main methods used for measuring eye pressure:
If the increase in eye pressure is gradual, there are no symptoms since the pressure builds very slowly.
On the other hand, the rapid rise in pressure that happens from a blocked drainage angle would result in symptoms that include pain in the eye, blurred vision, redness in the eye, and seeing halos around light.
High eye pressure is a major risk factor for glaucoma because the higher than average pressure can result in the optic nerve being damaged over time. There are several treatments for glaucoma depending on the type of glaucoma that is diagnosed – open angle or closed angle; both laser and surgical treatments are available. Learn more about the procedures here.
If you suffer from glaucoma, or suspect you might have the condition, and would like to discuss potential treatment options, make an enquiry or call on 0203 369 2020
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