Effect of Providing Near Glasses on Productivity Among Rural Indian Tea Workers with Presbyopia (PROSPER): A Randomised Trial

  • Presbyopia, age-related decline in near vision, is the most common cause of vision impairment globally, but no trials have assessed its workplace effects.

  • This trial studies the effect of near glasses on the productivity of 751 tea workers with presbyopia in India.

  • A substantial productivity increase was achieved in this rural cohort by providing glasses to correct presbyopia, with little cost and high intervention uptake.

  • The main study outcome was the difference between randomised groups in the change in mean daily weight of tea picked between the baseline period and the evaluation period.

Publication date

September 10, 2018


The Lancet Global Health

Sponsor Institution

Clearly & Ulverscroft Foundation (UK)


Priya Adhisesha Reddy, Nathan Congdon, Graeme MacKenzie, Parikshit Gogate, Qing Wen, Catherine Jan, Mike Clarke, Jordan Kassalow, Ella Gudwin, Ciaran O'Neill, Ling Jin, Jianjun Tang, Ken Bassett, David H Cherwek, Rahul Ali
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