ποΈ
Preventable Blindness
Roughly 1 billion people have vision impairment that could be prevented or corrected
β Improving
π©Ί Health
π§ Understand
The trend
Trachoma and river blindness are being eliminated country by country; cataract surgery keeps getting cheaper and more available. Aging populations push the other way.
The scale
On the order of 43 million people are blind and ~1 billion have preventable or uncorrected impairment β over half of it fixable with glasses or a 15-minute cataract surgery. 90% live in low- and middle-income countries.
Root causes
Cataracts (the top cause of blindness), uncorrected refractive error (the top cause of impairment β literally the lack of glasses), plus infectious causes like trachoma where water and sanitation are poor.
Who suffers most
The rural elderly poor (cataracts), schoolchildren who can't see the board (refractive error), and the poorest communities without clean water (trachoma). Blindness pulls a family member out of work to become a caregiver.
Common misconception
"Blindness is mostly incurable fate." More than half of it is solved by two of medicine's most routine fixes: eyeglasses and cataract surgery.
β‘ What actually works
Cataract surgery programs
Strong evidence
High-volume, low-cost surgery camps and eye hospitals restoring sight in minutes.
Cost & effect: Roughly $25β100 per surgery in efficient programs β sight restored for the price of a dinner out.
Glasses provision
Strong evidence
School screening and cheap corrective lenses.
Cost & effect: A few dollars per pair; trials show immediate learning and productivity gains.
Trachoma elimination (SAFE strategy)
Strong evidence
Surgery, antibiotics, face-washing, environmental improvement β a package that has eliminated trachoma in 15+ countries.
Cost & effect: Antibiotic distribution costs well under a dollar per person per round.
π§ Act
πΆ With your money
Fund cataract and glasses org types β few donations produce a more tangible before/after.
Compare vision-focused causes in the Charity Comparison Engine.
β° With your time
Donate old eyeglasses through collection programs; organize a drive via platforms like Givelink.
π οΈ With your skills
Optometrists and ophthalmologists: high-volume surgical org types run on visiting professionals.
π£ With your voice
Vision is a neglected, unusually solvable cause β recommend it to friends looking for a first cause to support.
π£ Share this
β Questions people ask
How can I help with preventable blindness?
There's a concrete step for whatever you can offer. With your money, fund cataract and glasses org types β few donations produce a more tangible before/after. With your time, donate old eyeglasses through collection programs; organize a drive via platforms like Givelink. With your skills, optometrists and ophthalmologists: high-volume surgical org types run on visiting professionals. With your voice, vision is a neglected, unusually solvable cause β recommend it to friends looking for a first cause to support.
What is the most effective way to reduce preventable blindness?
The approaches with the strongest evidence: Cataract surgery programs: High-volume, low-cost surgery camps and eye hospitals restoring sight in minutes. Roughly $25β100 per surgery in efficient programs β sight restored for the price of a dinner out. Glasses provision: School screening and cheap corrective lenses. A few dollars per pair; trials show immediate learning and productivity gains.
Where should I donate to help with preventable blindness?
Impact Compass doesn't name individual charities. The higher-leverage path is to back the interventions that work best here (Cataract surgery programs, Glasses provision) and to choose organizations by how transparently they deliver them. Compare organization types for this cause with the free tools linked above, or give useful items directly through Givelink.
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Rough figures for context, drawing on: WHO World Report on Vision Β· IAPB Vision Atlas Β· Lancet Global Health. Approximations, not citations. Last reviewed 2026-07-16.
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