Blindness refers to a condition where a person suffers from any of the following
a. Total absence of sight.
b. Visual acuity not exceeding 6/60* or 20/200 (Snellen) in the better eye with best correcting lenses
c. Limitation of field of vision subtending an angle of 20 degree or worse
* 6/60- means one can see at 6 metres what someone with standard vision could see from 60 metres away.
In India a person with a VA < 6/60 is legally blind
Person with low vision means a person with impairment of vision of less than 6/18 to 6/60 with best correction in the better eye or impairment of field in any one of the following categories:
a. Reduction of fields less than 50 degrees
b. Heminaopia with macular involvement
c. Altitudinal defect involving lower fields
20/20 is considered normal vision.
|Categories of Visual Impairment|
|WHO Definition||Working||Indian Definition|
|1||<6/18- 6/60||Visual Impairment||Low Vision||Low Vision|
|2||<6/60- 3/60||Severe Visual Impairment||Low Vision||Blind|
|3||<3/60- 1/60||Blind||Low Vision||Blind|
|4||<1/60- PL||Blind||Low Vision||Blind|
|5||NPL||Blind||Total Blindness||Total Blindness|
|Categories of Visual Correction|
|CATEGORY||Better Eye||Worse Eye||% Age Impairment|
|Category 0||6/9-6/18||6/24 to 6/36||20%|
|Category I||6/18-6/36||6/20 to Nil||40%|
|Category II||6/40-4/60 or field of vision 10o-20o||3/60 to Nil||75%|
|Category III||3/60 to 1/60 or field of vision 10o||F.C. at 1 ft. to Nil||100%|
|Category IV||F.C. at 1 ft. to Nil or field of vision 10o||F.C. at ft. to Nil||100%|
|One eyed person||F.C. at 1 ft. to Nil or field of vision 10o||6/6||30%|
F.C. means Finger Count.
- compiled & published by Dr Dhaval Patel MD AIIMS
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