What is the basic defect in open angle glaucoma?

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Why does this disease occur? What is wrong with the eye?

At the junction of both the cornea and the iris is formed a sieve called the trabecular meshwork. The picture below shows this sieve.

In different patients, due to various reasons, the holes of this sieve become closed, which obstructs the drainage of aqueous from the eye, and the pressure of the eye begins to increase and the optic nerve begins to be damaged.

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