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Eye pressure is just one risk factor for developing glaucoma, albeit a most important risk factor, and the main one that can be modified.

A healthy eye must have some pressure within it. Without any pressure it would collapse like a balloon with a puncture. So the eye has a pump that produces a very small amount of fluid. That fluid circulates from behind your iris to the drainage channels in front it. The volume of fluid that can drain out of the eye determines the resulting eye pressure. If the fluid drains readily then the eye pressure will be low, but if there is resistance to drainage the eye pressure will rise.

Click here to read a full article from February 2008 Eyelights:
Your Eye Examination Part 1: Your Eye Pressure

Glaucoma is diagnosed by detecting the damage to the optic nerve either directly by looking at it or indirectly by testing the visual field. The eye pressure level is not essential to a diagnosis of glaucoma. But it is the most important risk factor for developing glaucoma.

Many studies have shown that as the eye pressure rises the risk of glaucoma is much greater. And many clinical studies have shown that reducing the eye pressure is very effective in controlling glaucoma damage.

What eye pressure doesn’t tell you is whether the glaucoma damage to your optic nerve is stable or progressive. That can only be determined by assessing the optic nerve head or testing the visual field

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