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单词 Blindism
释义

Blindism

英语百科

Visual impairment

A typical Snellen chart that is frequently used for visual acuity testing.
The burden of onchocerciasis: children leading blind adults in Africa
Re-educating wounded. Blind French soldiers learning to make baskets, World War I.

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 people difficulties with normal daily activities such as driving, reading, socializing, and walking.

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