Canadian National Institute for the Blind spokesperson Rose Misner tells CHSJ News glaucoma involves damage to the optic nerve and sometimes people with normal eye pressure can develop it.
She says it's silent and painless because it happens so gradually and a lot of damage is done but, she says it can be controlled.
Misner adds risk factors for glaucoma include age, family history and nearsightedness.
The CNIB is holding a contest in honour of World Glaucoma Week where you could win a trip just for submitting photos. For more info, click here
