The definition of legal blindness used in this country requires a best-corrected distance visual acuity of 20/200 or worse in the better eye or a visual field reduction to 20[degrees] in diameter or less. Prevalence and characteristics of dual sensory impairment (hearing and vision) in a veteran population.
Beaverton, Oregon. Beaverton is a city in Washington County, in the U.S. state of Oregon. The city center is 7 miles (11 km) west of downtown Portland in the Tualatin River Valley. As of the 2010 census, the population is 89,803. This makes it the second-largest city in the county and Oregon's sixth-largest city.
Lewiston is the principal city of the Lewiston, ID - Clarkston, WA Metropolitan Statistical Area, which includes all of Nez Perce County and Asotin County, Washington. As of the 2010 census, the population of Lewiston was 31,894, up from 30,904 in 2000. Lewiston is located at the confluence of the Snake River and Clearwater River, thirty miles (50 km) southeast of the Lower Granite Dam.