H54 - Blindness and low vision
H54.8 - Legal blindness, as defined in USA
InclusionTerm:
-Blindness NOS according to USA definition
Excludes 1:
-legal blindness with specification of impairment level H54.0-H54.7)
notes:
-The table below gives a classification of severity of visual impairment recommended by a WHO Study Group on the Prevention of Blindness, Geneva, 6-10 November 1972.
-The term 'low vision' in category H54 comprises categories 1 and 2 of the table, the term 'blindness' categories 3, 4 and 5, and the term 'unqualified visual loss' category 9.
-If the extent of the visual field is taken into account, patients with a field no greater than 10 but greater than 5 around central fixation should be placed in category 3 and patients with a field no greater than 5 around central fixation should be placed in category 4, even if the central acuity is not impaired.
visualImpairment:
visCategory:
heading:
Category of visual impairment
visRange:
heading:
Visual acuity with best possible correction
visMax:>heading:
Maximum less than:
visMin:
heading:
Minimum equal to or better than:
visCategory:
value:
1
visRange:
visMax:>value:
6/18
visMin:
value:
6/60
visRange:
visMax:>value:
3/10(0.3)
visMin:
value:
1/10(0.1)
visRange:
visMax:>value:
20/70
visMin:
value:
20/200
visCategory:
value:
2
visRange:
visMax:>value:
6/60
visMin:
value:
3/60
visRange:
visMax:>value:
1/10(0.1)
visMin:
value:
1/20(0.05)
visRange:
visMax:>value:
20/200
visMin:
value:
20/400
visCategory:
value:
3
visRange:
visMax:>value:
3/60
visMin:
value:
1/60(finger counting at one meter)
visRange:
visMax:>value:
1/20(0.05)
visMin:
value:
1/50(0.02)
visRange:
visMax:>value:
20/400
visMin:
value:
5/300(20/1200)
visCategory:
value:
4
visRange:
visMax:>value:
1/60(finger counting at one meter)
visMin:
value:
Light perception
visRange:
visMax:>value:
1/50(0.02)
visRange:
visMax:>value:
5/300
visCategory:
value:
5
visRange:
visMax:>value:
No light perception
visCategory:
value:
9
visRange:
visMax:>value:
Undetermined or unspecified