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

Having 20/40 or worse vision in the better eye even with eyeglasses.

A person aged 18 or older.

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Odds Statement provided by Book of Odds Inc., http://www.bookofodds.com/content/view/full/129421 (Accessed: )

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