Health · By Calculation Hub · Published
Vision Impairment Statistics: Age and Regional Differences
Understand WHO vision impairment estimates, age patterns and regional differences, with primary-source links, data dates and clear limits on interpretation.
Sources checked . This is a review date, not necessarily the year the data describe.
The World Health Organization (WHO) estimates that at least 2.2 billion people have near or distance vision impairment. That headline covers more than blindness, and it should not be read as the number of people who cannot see at all. Understanding the type of impairment, the population studied and the underlying data date matters as much as the number.
Vision impairment statistics at a glance
Every figure in this table comes from WHO's Blindness and vision impairment fact sheet, published February 10, 2026 and checked November 8, 2026. The fact sheet summarizes earlier research; publication in 2026 does not make these a census of the 2026 population.
| Measure | Reported estimate | What it means |
|---|---|---|
| People with near or distance vision impairment worldwide | At least 2.2 billion | Combined near-or-distance estimate; not a count of blindness alone. |
| People whose impairment could have been prevented or is not yet addressed | At least 1 billion | A subset of the global near-or-distance estimate, not an additional population. |
| Distance impairment prevalence in low- and middle-income regions | 4 times the prevalence in high-income regions | A regional comparison of distance impairment, not all eye conditions. |
| Unaddressed near vision impairment in western, eastern and central sub-Saharan Africa | Greater than 80% | WHO's near-vision measure; not a statement that over 80% of all residents have vision impairment. |
| Unaddressed near vision impairment in high-income North America, Australasia, western Europe and Asia-Pacific | Lower than 10% | The comparative near-vision measure, not overall population prevalence. |
We preserve WHO's qualifiers such as “at least”, “greater than” and “lower than”. They are not exact counts or interchangeable percentage thresholds. We do not divide the two rounded global estimates to produce a precise preventable share.
How vision impairment varies with age
WHO reports that most people with vision impairment and blindness are over 50, while emphasizing that vision loss affects people of all ages. This is an age pattern, not a published prevalence percentage for each age band. The fact sheet does not provide enough age-specific denominators to construct a trustworthy table of rates for children, working-age adults and older adults.
For children, WHO describes differences in the leading causes across country income groups: congenital cataract is a leading cause in low-income countries, while retinopathy of prematurity is more prominent in middle-income countries. It also identifies uncorrected refractive error as a leading cause across countries for children and adults. Those observations do not supply a single global childhood prevalence rate.
The cataract coverage research linked from WHO's February 11, 2026 news release concerns adults aged 50 years and older. Its findings therefore should not be extended automatically to younger people or to every cause of vision impairment. The release describes analysis of 68 country estimates for 2023 and 2024; those are not 2026 survey results.
Regional differences depend on the measure
WHO estimates distance vision impairment prevalence to be four times higher in low- and middle-income regions than in high-income regions. This is a ratio, not a four-percentage-point difference. It does not establish the prevalence of an individual country or predict an individual person's vision.
The same fact sheet reports rates of unaddressed near vision impairment above 80% in western, eastern and central sub-Saharan Africa, compared with below 10% in the named high-income regions. Keep that measure separate from distance impairment and from the global combined count. The summary does not present those percentages as the share of all residents with any type of vision loss.
Access to treatment is another distinct regional measure. WHO's cataract release reports that three in four people in the African Region who need cataract surgery remain untreated. The denominator is people needing that surgery, not everyone living in the region. The release also reports lower access for women than men across regions, without providing a single sex-specific percentage that can be transferred to every country.
Causes within the preventable or unaddressed burden
Within its discussion of the at-least-one-billion preventable or unaddressed cases, WHO lists cataract (94 million), refractive error (88.4 million), age-related macular degeneration (8 million), glaucoma (7.7 million) and diabetic retinopathy (3.9 million) as the main conditions causing distance impairment or blindness. For near impairment, it lists presbyopia at 826 million.
These are not counts of everyone who has each disease, and they should not be presented as a fresh 2026 disease census. WHO cites a 2021 analysis of causes in 2020 for the distance figures, and a 2018 systematic review, meta-analysis and modelling paper for presbyopia. We retain the rounded values and their original context rather than adding them into an apparently exact total.
“Could have been prevented or is yet to be addressed” also does not mean that every case can be reversed. WHO distinguishes prevention, treatment and rehabilitation, and explains that some conditions require early detection and timely treatment to avoid irreversible loss. A headline about unmet need cannot determine what treatment is appropriate for a particular person.
What your own vision numbers can tell you
The vision calculator can help explain relationships between Snellen, decimal and logMAR acuity notation and prescription values. It is an educational calculation, not a clinical examination or a tool for assigning someone to a population-statistics category. Its approximate conversions do not diagnose an eye condition or establish eligibility under a country's legal blindness rules.
Do not use a population estimate as a personal risk score. WHO emphasizes access to quality eye care and notes that causes vary between and within countries. If you have a concern about your vision, take it to a qualified eye-care professional rather than treating a converted number or regional statistic as a diagnosis.
Methodology, data dates and primary sources
This article summarizes public WHO material; it is not original medical research. We checked the two pages below on November 8, 2026. We have not collected calculator inputs, inferred missing age-band rates, estimated country totals or calculated an overall prevalence percentage from a separate population dataset.
Source publication dates, model years and access dates describe different things. The February 10, 2026 fact sheet cites studies published in 2021 and 2018 for the distance and near estimates discussed above. The February 11, 2026 cataract release describes country estimates for 2023 and 2024. Consult the linked studies in those WHO pages before reusing the figures in research requiring full definitions, model assumptions or uncertainty intervals.
- WHO: Blindness and vision impairment — February 10, 2026. Global counts, regional comparisons, age patterns, causes and underlying research references.
- WHO: One in two people facing cataract blindness need access to life-changing surgery — February 11, 2026. Cataract access gaps, country-estimate years and the linked adult coverage study.