January is National Glaucoma Awareness Month, an important time to spread the word about this sight-stealing eye disease.

In the United States, approximately 120,000 people are blind from glaucoma, accounting for 9% to 12% of all cases of blindness.

Currently, more than 3 million people in the United States have glaucoma. The National Eye Institute projects this number will reach 4.2 million by 2030, a 58 percent increase.

Glaucoma is called "the sneak thief of sight" since there are no symptoms and once vision is lost, it's permanent. As much as 40% of vision can be lost without a person noticing.

Glaucoma is the leading cause of irreversible blindness. Moreover, among African American and Latino populations, glaucoma is more prevalent. Glaucoma is 6 to 8 times more common in African Americans than Caucasians.

Over 3 million Americans, and over 60 million people worldwide, have glaucoma. Experts estimate that half of them don't know they have it. Combined with our aging population, we can see an epidemic of blindness looming if we don't raise awareness about the importance of regular eye examinations to preserve vision. The World Health Organization estimates that 4.5 million people worldwide are blind due to glaucoma.

Video: Dr. Constance Okeke discusses Glaucoma Awareness Month (Watch the 30-second video)

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