Waqar, S., C. Holdstock, and N. Evans. “Patient Reported Evaluation of Functional Symptoms (PREFS): A Simple Method of Ascertaining Patient Satisfaction Post Cataract Surgery”. Nepalese Journal of Ophthalmology, vol. 4, no. 2, July 2012, pp. 346-7, doi:10.3126/nepjoph.v4i2.6562.