--- title: "Global eye health and preventable blindness" description: "WHO-led preventable blindness programmes: trachoma, onchocerciasis, vitamin A deficiency, leprosy-related eye disease, and why they matter." url: https://eyehealthguide.org/eye-care/global-eye-health/ source: Eye Health Guide licence: "General information only. Cite the URL and the named medical reviewer." --- Eye care guide # Global eye health and preventable blindness Medical reviewer [Mr Mohamed Mohyudin](https://eyehealthguide.org/reviewers/mohamed-mohyudin/)· Last recorded site review July 6, 2026 ### About this review This page inherits the site’s previous review record. A separate, current article sign-off has not yet been recorded. [How review works](https://eyehealthguide.org/reviewers/) · [Official biography & credentials](https://mohamedmohyudin.co.uk/author/mohamed-mohyudin/) Quick answer Most blindness worldwide is preventable. WHO and partners focus on infections, malnutrition and nerve damage that scar the eye in low-resource settings — including trachoma, onchocerciasis (river blindness), vitamin A deficiency and leprosy-related corneal damage. Mass treatment, surgery, clean water and nutrition have cut blindness rates sharply, while routine eye exams still matter everywhere for glaucoma, diabetes and cataracts. ### On this page ⌄ 1. Why global eye health matters 2. WHO priority conditions on this site 3. What actually prevents blindness 4. If you live far from endemic areas 5. Frequently asked questions ## Why global eye health matters In high-income countries, cataracts, glaucoma and macular disease dominate. In many regions, childhood blindness and corneal scarring from infection and malnutrition remain major challenges. The same principles apply everywhere: find disease early and treat before the retina or cornea is permanently damaged. ## WHO priority conditions on this site Our condition library includes plain-language guides aligned with WHO and NHS sources. Explore these for detail rather than duplicating full programme manuals here. - Trachoma — infection scarring eyelids inward; SAFE strategy with surgery, antibiotics, face washing and water - Onchocerciasis — river blindness from black-fly spread worm disease; community ivermectin programmes - Vitamin A deficiency — xerophthalmia and childhood night blindness; supplementation and diet - Leprosy-related eye disease — nerve damage causing dry, exposed corneas; lifelong eye protection - Cysticercosis — pork tapeworm larvae can reach the eye in endemic areas; hygiene and thorough cooking reduce risk - Retinopathy of prematurity — screening and laser or injections for premature babies ## What actually prevents blindness Prevention mixes public health and individual care: mass drug administration, vitamin supplementation, trichiasis surgery, neonatal ROP screening, plus everyday access to glasses, diabetic eye screening and cataract surgery as countries build capacity. ## If you live far from endemic areas These topics still build credibility and context for donors, clinicians and travellers. Short tourist visits to endemic regions carry very low risk for trachoma or river blindness, but long-term aid workers should follow occupational health advice. Malnutrition-related vitamin A eye disease can rarely appear anywhere with severe deficiency. See our regional guides for Indonesia and Latin America for curated links. ## Frequently asked questions ### What are the leading preventable causes of blindness worldwide? WHO highlights untreated cataract, uncorrected refractive error, glaucoma, age-related macular degeneration, diabetic retinopathy, trachoma, onchocerciasis and childhood causes including vitamin A deficiency and retinopathy of prematurity. ### Is trachoma still a problem? Yes in some endemic countries, though WHO elimination programmes have removed it as a public health problem in many regions through antibiotics, surgery and sanitation. ### How can I support global eye health? Donate to reputable sight charities, support clean water and vaccination programmes, and avoid duplicating unqualified outreach. Clinicians can volunteer through established organisations with proper training and follow-up. Your next step ## Take this to your appointment Write down what has changed, when it started, your current medicines and the questions you want answered. Take these to your eye-care appointment. Sudden loss of sight, severe eye pain or a dark curtain across vision needs immediate assessment. Do not wait to complete a worksheet. ## Trusted sources For general background, these organisations provide eye-health information. This list is further reading, not a record that they reviewed this article. - [NHS — Health A to Z](https://www.nhs.uk/conditions/) - [Moorfields Eye Hospital NHS Foundation Trust](https://www.moorfields.nhs.uk/) - [American Academy of Ophthalmology — EyeHealth](https://www.aao.org/eye-health) - [National Eye Institute (NIH)](https://www.nei.nih.gov/) - [College of Optometrists — Look After Your Eyes](https://lookafteryoureyes.org/) - [World Health Organization — Eye care, vision impairment and blindness](https://www.who.int/health-topics/blindness-and-vision-loss)