Effect of providing near glasses on productivity among rural Indian tea workers with presbyopia (PROSPER): a randomised trial by Priya Adhisesha Reddy, MBA, Nathan Congdon, ProfMD, Graeme MacKenzie, DPhil, Parikshit Gogate, FRCS (Edin), Qing Wen, PhD, Catherine Jan, BOptom (Hon), Mike Clarke, ProfDPhil, Jordan Kassalow, OD, Ella Gudwin, MA, Ciaran O'Neill, ProfPhD, Ling Jin, MS, Jianjun Tang, PhD, Ken Bassett, ProfMD, David H Cherwek, MD, Rahul Ali, MBBS

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