This week is World Glaucoma Week - to bring attention to what glaucoma is and how it affects you. Glaucoma results of a build up of pressure in the eye which results in the optic nerve being crushed - and hence your peripheral vision (initially) and then your forward vision (subsequently) being lost. Untreated, you will go blind. Caught early and it may only require drops in the eye to keep it under control.
How do you know you have it? . You won't. There is no pain, dull ache or any other physical symptom. Having a regular, thorough eye examination is the best way to protect yourself.
Any damage done is irrevocable so catching it early is very important.
If either of your parents have it, you are much more likely to get it (but not guaranteed to do so). Again, a regular eye examination is your best defence.