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What causes glaucoma?

Damage to the optic nerve is often caused by increased pressure in the eye (intraocular pressure). This can happen when extra fluid builds up in the eye, such as when the eye makes too much fluid or does not drain well. But some cases of glaucoma aren’t caused by increased pressure. In these cases, the cause may not be found.

You can get glaucoma after an eye injury, after eye surgery, or because of an eye tumor. Some medicines (corticosteroids) that are used to treat other diseases may cause glaucoma.

source: http://www.webmd.com/eye-health/tc/glaucoma-topic-overview