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Definition of Visual Impairment
Visual (Vision) Impairment is a reduction in vision - usually associated with age - that cannot be corrected by prescription glasses, contact lenses, medicine or even surgery. It can range from low to severe. In effect, a person diagnosed with visual impairment has difficulty fulfilling his/her regular daily functions. Visual Impairment typically calls for a change in lifestyle and a solid support system.
The World Health Organization (WHO) has issued the following classifications of visual impairment:
- Mild Vision Loss or Near-Normal Vision - 20/30 to 20/60
- Moderate Visual Impairment - 20/70 to 20/160
- Severe Visual Impairment - 20/200 to 20/400
- Profound Visual Impairment - 20/500 to 20/1000
- Near-Total Visual Impairment - less than 20/100
- Total Visual Impairment - no light perception at all
Sources: Medical Dictionary & National Institute of Medicine
