Glaucoma affects 2% of the population over 40
Glaucoma is a common eye disease, affecting about 2% of the population over 40 years of age. It becomes more common in older people. It can happen in younger patient, even children, though this is rare.
Glaucoma is a disease that affects your optic nerve, which connects your eye to your brain and allows you to see. In glaucoma, the optic nerve becomes damaged and in its early to moderate stages has no symptoms that you would notice.
Eventually, it eats away at your side vision. You can lose a lot of your side vision before you notice, mostly because you have 2 eyes and the side vision of both eyes overlaps a lot.