Epidemiology & Technology

ICD 11 Vision Categories

When analyzing data from blindness surveys, one needs to map out visual acuity against the Visual impairment categorized in ICD. There are some nuances, especially w.r.t Moderate visual impairment (MVI) based on the charts used as some VA charts yield 6/18 vision while others yield 6/19.

ICD11 Categories

ICD 11 Categories of Vision impairment

Based on the above, we can arrive at the following

Conversion of Vision Readings to ICD-11 Vision categories

SNELLENS 6 metre
ICD 11Worse thanUp to
No VI6/12
Mild VI / EVI6/126/18
Moderate VI6/186/60
Severe VI6/603/60
ICD 11Worse thanUp to
No VI0.3
Mild VI / EVI0.30.5 / 0.47 used by RAAB Scripts
Moderate VI0.5/ 0.47 used by RAAB Scripts1.0
Severe VI1.01.3

Logmar Values used in RAAB analysis: RAAB6_reporter.Rmd Lines 1482-1496

  • 0.3: Can see 6/12
  • 0.47 = Cannot see 6/12, Can see 6/18
  • 1.0= Cannot see 6/18, Can see 6/60
  • 1.3= Cannot see 6/60, Can see 3/60
  • 1.8 = Cannot see 3/60, but can see 1/60
  • 3.0 = Light Perception (PL+)
  • 4.0 = No light perception (NPL/PL-)

ICD 11Worse thanUp to
No VI0.5
Mild VI / EVI0.50.3
Moderate VI0.30.1
Severe VI0.10.05
LogMAR / ETDRS 6metre
ICD 11Worse thanUp to
No VI6/12
Mild VI / EVI6/126/19
Moderate VI6/196/60
Severe VI6/603/60
ETDRS 20 feet
ICD 11Worse thanUp to
No VI20/40
Mild VI / EVI20/4020/70
Moderate VI20/7020/200
Severe VI20/20020/400
ETDRS 4 metres
ICD 11Worse thanUp to
No VI4/8
Mild VI / EVI4/84/12
Moderate VI4/124/40
Severe VI4/404/80
LogMAR 13 Feet
ICD 11Worse thanUp to
No VI13/26
Mild VI / EVI13/2613/42
Moderate VI13/4213/131
Severe VI13/13113/260

All these are based on the VA conversions using standard formulae.

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