- A decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses. Some classifications 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. ← Wikipedia
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