Source(s)

Vision Problems in the U.S. Prevalence of Adult Vision Impairment and Age-Related Eye Disease in America. Prevent Blindness America. 2008. http://www.preventblindness.org/vpus/2008_update/VPUS_vision_impairment_
blindness_2008.pdf

Definitions

Glaucoma is a disease that causes a gradual degeneration of cells that make up the optic nerve, which carries visual information from the eye to the brain. As the nerve cells die, vision is slowly lost, usually beginning in the periphery. Primary open-angle glaucoma is caused by trabecular blockage which is where the aqueous humor in the eye drains out. Because the microscopic passage ways are blocked, the pressure builds up in the eye and causes imperceptible very gradual vision loss.

The term non-Hispanic refers to persons who trace their origins or descent to a place other than Mexico, Puerto Rico, Cuba, Spanish speaking Central and South America countries, and other Spanish cultures. People who identify their ethnicity as non-Hispanic may be of any race.

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Rounding Rules

Odds more likely than 1 in 10, such as 1 in 3.42, are rounded to three significant digits. Odds less likely than 1 in 10, such as 1 in 420.4, are rounded to four significant digits. Trailing zeros after the decimal point are dropped for readability, even though they may still be significant.

Odds you'll see: 1 in 4.26; 14.5; 143; 5,230; 433,200

Odds you won't see: 1 in 2.412; 63.042; 425,242c