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Key facts about Blindness and vision impairment

to World Health Organization’s Fact Sheet –

Globally, at
least 2.2 billion people have a vision impairment or blindness, of whom at
least 1 billion have a vision impairment that could have been prevented or has
yet to be addressed.

This 1
billion people include those with moderate or severe distance vision impairment
or blindness due to unaddressed refractive error, as well as near vision
impairment caused by unaddressed presbyopia.

the leading causes of vision impairment are uncorrected refractive errors and

The majority
of people with vision impairment are over the age of 50 years.

impairment Definitions

International Classification of Diseases 11 (2018) classifies vision impairment
into two groups, distance and near presenting vision impairment.

vision impairment:

Mild –
presenting visual acuity worse than 6/12

Moderate –
presenting visual acuity worse than 6/18

Severe –
presenting visual acuity worse than 6/60

Blindness –
presenting visual acuity worse than 3/60

Near vision

near visual acuity worse than N6 or M.08 with existing correction.

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.

Causes of
vision impairment

the leading causes of vision impairment are:

refractive errors


macular degeneration





There is
some variation in the causes across countries. For example, the proportion of
vision impairment attributable to cataract is higher in low- and middle-income
countries than high-income countries. In high income countries, diseases such
as diabetic retinopathy, glaucoma and age-related macular degeneration are more

children, the causes of vision impairment vary considerably across countries.
For example, in low-income countries congenital cataract is a leading cause,
whereas in high income countries it is more likely to be retinopathy of

to address vision impairment

Effective interventions are available for health promotion, prevention, treatment and rehabilitation to address the entire range of needs associated with eye conditions and vision impairment across the life course. Some are among the most feasible and cost-effective to implement. For example, uncorrected refractive error can be corrected with glasses while cataract surgery can restore vision. Vision rehabilitation is also effective in improving functioning for people with an irreversible vision impairment.

(Source: WHO Fact Sheet)

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