As the world prepares to mark World Sight Day on 8th October 2026, eye health advocates are pointing to a simple fact: many children who seem to be struggling at school are struggling to see. They find it difficult reading their books or taking notes, and they can barely read what is written on the blackboard.
Data from the International Agency for the Prevention of Blindness (IAPB) shows that uncorrected refractive error is the leading cause of vision impairment in children. In Tanzania it accounts for an estimated 27,178 years of lost schooling every year.
The same data shows the cost of that loss. A child whose vision problem is identified at age five and corrected with quality glasses through to age 18 could see their lifetime earnings rise by 124%, in effect doubling them. Tanzania is one of 23 countries where IAPB found this to be the case.
Eye health experts often say that about 80% of learning is visual. Children read the board, follow text and copy notes with their eyes. When vision is blurred, a bright child can be mistaken for a slow one, or one who isn’t trying.
"A child who can’t see the board can easily be mistaken for a child who isn’t learning,” said Anadine Marshall, Programs Director at CharityVision International. “A simple vision screening can identify a problem that might otherwise go unnoticed for years.”
Vision barriers can affect any child’s education, and if they go unaddressed, the effects can last a lifetime. Children who fall behind early may repeat classes, lose confidence or leave school sooner, all of which can limit their future earning power.
Tanzania’s Ministry of Health has recognised child eye health as a priority.
In 2019 it added eye health to the country’s Integrated Management of Newborn and Childhood Illness (IMNCI) strategy, and more than 3,500 primary health care workers have since been trained under IMNCI, including its eye health module.
Ministry data cited in the Community Eye Health Journal indicates these health workers see an average of 5.8 million children a year, which could mean identifying nearly 250,000 children with eye problems annually.
That is a large number of children who need follow-up care, and it shows why reaching them early matters.
Behind these figures are children like Ahmed Ally and Consolatha David.
Ahmed, 16, from Zanzibar, lived for years with a blurred view of the world beyond arm’s length. He struggled to read the blackboard, and his family could not afford eye care.
Learning became so difficult that he had to repeat several classes. Then a school eye-screening team visited his school and screened his vision for the first time.
They found high myopia and referred him for an examination and a prescription. When he put on his first pair of glasses, his teachers celebrated with him. Today, he can follow his lessons and take part in class with renewed confidence.
Consolatha, 8, dreams of becoming a doctor. When she couldn’t see the board, she assumed the problem was her seat, and her teacher moved her to the front. It didn’t help.
Her teacher told her parents she needed glasses, but they could not afford eye care and told her to stay home.
Then the SightBuddies school screening programme arrived at Chibelela Sokoine Primary School, one of the first schools it visited. Her mother brought her to the free screening, where she received the glasses she needed. She is back in school, seeing her lessons clearly and working toward her dream.
SightBuddies: taking eye care to the classroom
SightBuddies is a school-focused vision screening initiative run by CharityVision. It provides free or low-cost prescription glasses and eye care to children, reaching them where they already are: in school.
For families who cannot afford or reach an eye clinic, a screening at school can be the first step.
"By reaching children at school and providing glasses when they need them, we can remove a simple barrier that can make an enormous difference in their education, confidence, and future,” Marshall said.
A call to act
IAPB Chief Executive Peter Holland said a simple eye test and glasses “could be one of the best investments a parent can make for their child’s future”. He urged governments to ensure every child has access to sight tests and glasses.
Sumrana Yasmin, Technical Director for Inclusive Health at Sightsavers, said investing in eye tests and glasses is about “unlocking potential, transforming lives, and ensuring no child is left behind.”
This World Sight Day, parents who can are encouraged to have their children’s eyes tested, and schools and communities are urged to support screening. As Ahmed’s and Consolatha’s stories show, one screening and one pair of glasses can change what a child sees and what they imagine for their future.
