Vision loss in numbers: what the WHO World Report on Vision and its 2026 update say

Most vision loss is not sudden. It builds up over years, through a cataract that slowly clouds the lens, a pair of glasses that was never prescribed, or raised eye pressure that nobody measured. The World Health Organization (WHO) published its first World Report on Vision in October 2019 and keeps the figures current in a fact sheet, last updated in February 2026. This post sets out those figures and what they imply for anyone who has been putting off an eye test.

The headline numbers

The second line is the one that matters for patients. Roughly half of all vision impairment is either preventable or treatable with services that already exist: an eye examination, spectacles, cataract surgery or management of glaucoma and diabetic eye disease.

What causes the unaddressed cases

WHO breaks the 1 billion figure down by cause. Presbyopia, the age-related loss of near focus that makes reading difficult from the mid-forties onwards, accounts for the largest part, and it is corrected with reading glasses.

Three of the six causes, presbyopia, refractive error and cataract, make up well over 90% of the unaddressed total, and all three are dealt with by routine services: a sight test and glasses, or a cataract operation. The remaining three, macular degeneration, glaucoma and diabetic retinopathy, are the ones where early detection changes the outcome, because damage to the retina or the optic nerve generally cannot be reversed.

Why where you live matters

WHO's figures show a steep gradient between regions.

Eastern sub-Saharan Africa, which includes Kenya, is in the group where more than 80% of near vision impairment goes uncorrected. In plain terms, most adults over about 45 in the region who struggle to read small print have never been given reading glasses. WHO's SPECS 2030 initiative, mentioned in the same fact sheet, targets more than 800 million people who need refractive error services.

Who should have an eye examination

WHO notes that most people with vision impairment and blindness are over 50, and that need rises with age. The following situations are generally reasons to book an eye examination rather than to wait:

• difficulty reading, or holding text further away than before;
• blurred distance vision, or squinting to see signs and screens;
• a known diagnosis of diabetes or high blood pressure, both of which affect the retina;
• a family history of glaucoma;
• a child who sits very close to screens, tilts the head to see, or is falling behind at school.

An eye examination is painless. An optometrist measures how well you see and whether glasses would help; an ophthalmologist is a medical doctor who diagnoses and treats eye disease and performs surgery. Many clinics offer both. An examination does not commit you to buying spectacles from the same clinic.

How we checked these figures

We opened the WHO fact sheet on blindness and visual impairment, dated 10 February 2026, and quoted its figures as printed, rounding where appropriate. We confirmed on the WHO publications page that the World Report on Vision was published on 8 October 2019 and that it gives the same 2.2 billion and 1 billion totals. We did not find a verified, dated figure for vision impairment in Kenya specifically from WHO or the Ministry of Health, so none is included; the regional figures for sub-Saharan Africa are used instead. All percentages are WHO's own.

If you want an eye test or an assessment of an eye condition, the ophthalmology and optometry pages list providers with their verification level. You can also tell us what you need and we will help you find a suitable clinic; the service is free.