More than 3 million people in the United States currently suffer from glaucoma, the Glaucoma Research Foundation reports. The National Eye Institute projects that the 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. And up to 40 percent of vision can be lost without a person noticing.
Glaucoma is also the leading cause of preventable blindness, and it's more prevalent among African American and Latino populations.
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