Y. Sapkota, S. Dulal, G. Pokharel, B. Pant, and L. Ellwein, “Prevalence and correction of near vision impairment at Kaski, Nepal”, Nep J Oph, vol. 4, no. 1, pp. 17–22, Feb. 2012, doi: 10.3126/nepjoph.v4i1.5845.