Visual
impairment, also known as vision impairment
or vision loss, is a decreased ability to
see to a degree that causes problems not
fixable by usual means, such as glasses.
Some also include those who have a decreased
ability to see because they do not have
access to glasses or contact lenses. Visual
impairment is often defined as a best corrected
visual acuity of worse than either 20/40
or 20/60. The term blindness is used for
complete or nearly complete vision loss.
Visual impairment may cause difficulties
with normal daily activities such as reading
and walking without adaptive training and
equipment.
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