The study has a name only an academic could love: Refractive error correction and harvest worker productivity in the Guatemalan coffee sector: A quasi-experimental analysis. It’s a mouthful. For this newsletter let’s call it Glasses for Guatemalan Harvesters.
Seva worked with long-time partner Visualiza, Guatemala’s leading eye hospital, to send researchers to 12 coffee farms during the 2023-2024 harvest. They noticed something easy to miss; some harvesters simply couldn’t see clearly enough to spot what they were picking. Coffee cherries, after all, are masters of disguise — tucked behind leaves, blending into branches. The solution was almost disarmingly simple. They provided eyeglasses to those who needed them.
The effect was immediate. Within days, workers were picking an extra 12 pounds of coffee per day, an 8% jump in productivity. No new equipment, no trainings, no laminated flowcharts. Just clearer vision.
For context, that kind of gain rivals what economists often attribute to an additional year of schooling. Only this upgrade rests lightly on your nose and costs a fraction of the price.
The returns are just as striking. Every $1 spent on eyeglasses generated about $11 in additional income for workers and $19 in profit for farm owners over three harvest seasons. A rare moment where doing good and doing well line up perfectly.
And even that doesn’t tell the whole story. The study didn’t try to measure improved safety, quality of life, or the simple, quiet relief of seeing clearly again.
To explore the findings, visit www.seva.org/coffee.
