9D43

ICD-11 MMS 2026-01

Impairment of contrast vision

Description

Contrast sensitivity refers to the ability to distinguish small differences in brightness between adjacent surfaces. Peak Contrast sensitivity refers to the smallest differences that are discernible for large stimuli. For smaller objects, such as those involved in many Activities of Daily Living, contrast sensitivity interacts with visual acuity and visual field. Better contrast makes smaller details visible. The visual field is larger for stronger stimuli.

Index terms

  • Impairment of contrast vision
  • Moderate impairment of contrast vision
  • Profound impairment of contrast vision

Exclusions from above levels

  • 01 – Certain infectious or parasitic diseases
  • 05 – Endocrine, nutritional or metabolic diseases
  • 18 – Complications of pregnancy, childbirth and the puerperium
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  • 19 – Certain conditions originating in the perinatal period
  • 22 – Injury, poisoning or certain other consequences of external causes
  • 8A21.0 – Posterior cortical atrophy

Sibling codes

  • 9D41 – Impairment of visual field
  • 9D42 – Patterns of visual field impairment
  • 9D44 – Impairment of colour vision
  • 9D45 – Impairment of light sensitivity
  • 9D46 – Impairment of binocular functions
  • 9D7Y – Other specified impairment of visual functions
  • 9D7Z – Impairment of visual functions, unspecified

Foundation entity

Impairment of contrast vision – http://id.who.int/icd/entity/136910467

Allowed postcoordination axes

Part of: 09: Diseases of the visual system