Visual impairment, like hearing loss, is most frequent among older persons. We use the term "blindness" when people have vision that measures 20/200 or worse, or when their range of vision is sharply restricted; "low vision" refers to measured vision that is 20/70 at best to 20/200 at worst, or the range is limited but not as much as in the case of blindness. The major difficulty students who are blind or have low vision encounter in education is in reading assigned materials. They may also have problems taking notes, but most individuals who have lived with a vision impairment for some time have figured out effective ways of doing that.