Walk into almost any classroom in a low- and middle-income country, and you will see a child at the back, squinting at the board, or a student who has stopped raising their hand altogether. Teachers may mark them as slow, unmotivated, or disruptive. Parents may think they are clumsy or simply going through a phase.
Too often, no one asks the simplest question: can this child actually see what is written in front of them? This is not a minor gap in the global education conversation. It is a structural blind spot.
UNESCO's 2026 Global Education Monitoring Report records 273 million children and youth out of school, a figure that has risen for seven consecutive years. The world spends enormous sums on teachers, infrastructure, and enrollment drives. Yet one of the most straightforward barriers to learning remains largely invisible to the systems meant to address it.
I have seen this firsthand through my work. When a child cannot see clearly, the consequences extend far beyond the classroom. A child who struggles to read the blackboard may be perceived as distracted or academically behind, when the real issue is simply that they cannot see.
Often, children themselves do not realize anything is wrong because they have never experienced clear vision. The evidence is not speculative. Research published by the International Agency for the Prevention of Blindness and Seva Foundation estimates that uncorrected refractive error (conditions such as myopia, hyperopia and astigmatism, which can often be corrected with glasses) affects 17.8 million children aged 5 to 17 worldwide.
The same analysis estimates that uncorrected refractive error among schoolchildren could result in $173 billion in lost future economic productivity annually, measured in purchasing-power-parity terms. Under one modeled scenario, a child who receives glasses at age five and continues wearing them until age 18 could earn 78 percent more over their lifetime than a child whose vision remains uncorrected. What the data cannot capture is why this problem persists.
Extract — continue reading at the source.
