From the October 30, 2012 New York Times:
“ACCORDING to the most recent government figures, about 11 percent of undergraduates, or over two million students, have a disability. Most have learning disabilities, like dyslexia or attention deficit hyperactivity disorder, but 15 percent have an orthopedic or mobility impairment; 6 percent have a hearing impairment; and 3 percent are blind or visually impaired.”
Guide to Accommodations for College Students With Disabilities – NYTimes.com.