Effect of providing near glasses on productivity among rural Indian tea workers with presbyopia (PROSPER) a randomised trial

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