January is National Glaucoma Awareness Month..
As much as 40 percent of vision can be lost without a person noticing. Glaucoma is the leading cause of irreversible blindness. Glaucoma is an eye disease that damages the optic nerve. The optic nerve connects the eye to the brain.
Dr. Ann Wonderling is the president of the Wisconsin Optometric Association says there is a reason why glaucoma can be troubling..
"No symptoms, so that is why it is considered the 'sneak thief of sight'. You can lose your eyesight without realizing it...."