Introduction
Visual impairment is when a person has sight loss that cannot be fully corrected using glasses or contact lenses.
Blindness as defined by national programme for control of blindness (NPCB) under following headings:
•Inability of a person to count fingers from a distance of 6 meters or 20 feet (technical definition)
•Vision 3/60 or less with the best possible spectacle correction
•Diminution of field vision to 20 feet or less in better eye
There are two main categories of visual impairment:
• Being partially sighted or sight impaired – where the level of sight loss is moderate
• Severe sight impairment (blindness) – where the level of sight loss is so severe that activities that rely on eyesight become impossible.
Types of Blindness:
Economic blindness: Inability of a person to count fingers from a distance of 6 meters or 20 feet technical Definition
Social blindness: Vision 3/60 or diminution of field of vision to 10°
Manifest blindness: Vision 1/60 to just perception of light
Absolute blindness: No perception of light
Curable blindness: That stage of blindness where the damage is reversible by prompt management e.g. cataract
Preventable blindness: The loss of blindness that could have been completely prevented by institution of effective preventive or prophylactic measures e.g. xerophthalmia, trachoma and glaucoma
Avoidable blindness: The sum total of preventable or curable blindness is often referred to as avoidable blindness.
- PUBLISHED DATE : Apr 06, 2015
- PUBLISHED BY : NHP CC DC
- CREATED / VALIDATED BY : NHP Admin
- LAST UPDATED BY : Apr 07, 2015
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