![]() For instance, cognitive ability will affect the ability to conceptualise the environment in the absence or reduction of visual information. The degree of impairment, personality, intelligence, background and the presence of other disabilities all have varying effects. Visually impaired individuals are all very different. The degree of residual functional vision refers to acuity, the ability to interpret visual information in a practical sense and the conditions under which residual vision is optimal. Dependent on the cause, the possible presence of other impairments may be indicated, as in rubella. Visual impairment present at birth could be due to genetic anomalies or due to injury to the developing visual system. The prevalence of significant visual impairment is around 1/2000 in the Western world. ![]() "Blind" is defined as having no more vision than light perception in both eyes and where corrective lenses would make no difference. "Visual impairment" refers to all degrees of reduction in vision.
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