Blindness and vision impairment | low vision population
DefinitionsTheInternationalClassificationofDiseases11(2018)classifiesvisionimpairmentintotwogroups,distanceandnearpresentingvisionimpairment.Distancevisionimpairment:Mild–visualacuityworsethan6/12to6/18Moderate–visualacuityworsethan6/18to6/60Severe–visualacuityworsethan6/60to3/60Blindness–visualacuityworsethan3/60Nearvisionimpairment:NearvisualacuityworsethanN6orM.08at40cm.Aperson’sexperienceofvisionimpairmentvariesdependinguponmanydifferentfactors.Thisincludesforexample,theavailabilityofpre...
DefinitionsThe International Classification of Diseases 11 (2018) classifies vision impairment into two groups, distance and near presenting vision impairment.
Distance vision impairment:
Mild –visual acuity worse than 6/12 to 6/18Moderate –visual acuity worse than 6/18 to 6/60Severe –visual acuity worse than 6/60 to 3/60Blindness –visual acuity worse than 3/60Near vision impairment:
Near visual acuity worse than N6 or M.08 at 40cm.A person’s experience of vision impairment varies depending upon many different factors. This includes for example, the availability of prevention and treatment interventions, access to vision rehabilitation (including assistive products such as glasses or white canes), and whether the person experiences problems with inaccessible buildings, transport and information. PrevalenceGlobally, at least 2.2 billion people have a near or distance vision impairment. In at least 1 billion – or almost half – of these cases, vision impairment could...