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De Winter CF, Jansen AAC, Evenhuis HM. Physical conditions and challenging behaviour in people with intellectual disability: a systematic review. J Intellect Disabil Res. 2011 Jul;55(7):675-98.

De Winter CF, Jansen AAC, Evenhuis HM. Physical conditions and challenging behaviour in people with intellectual disability: a systematic review. J Intellect Disabil Res. 2011 Jul;55(7):675-98.

Impaired vision, blindness

What are impaired vision and blindness? The WHO definition of impaired vision is that visual acuity (after correction!) is less than 0.3 but more than 0.05 or that the field of vision is less than 30...
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