Participants Characteristics and categories of Visual Impairment.
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* Moderate Visual Impairment is defined as presenting visual acuity worse than 6/18 to 6/60 in the better eye.# Blindness is defined as presenting visual acuity worse than 6/60 in the better eye.## Any visual impairment includes both the blindness and moderate visual impairment; Visual impairment categorized as yes or no.
创建时间：
2015-12-02
