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In cases of open-angle glaucoma, the angle where the iris and cornea meet is as wide as it should be, but the drainage tubules are unable to drain the eye effectively. The resulting pressure can cause blindness.

In cases of open-angle glaucoma, the angle where the iris and cornea meet is as wide as it should be, but the drainage tubules are unable to drain the eye effectively. Intraocular pressure builds up and can permanently damage the optic nerve and nerve fibres in the retina, leading to blindness.

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