1. World Health Organisation.Towards universal eye health: a global action plan 2014–2019 Geneva 2013. Available from:https://www.who.int/blindness/actionplan/en/. Accessed 24 Apr 2021.
2. Trends in prevalence of blindness and distance and near vision impairment over 30 years: an analysis for the Global Burden of Disease Study
3. World Health Organisation.World report on vision. Switzerland.2019. Available from:https://www.who.int/publications/i/item/9789241516570. Accessed 12 May 2021.
4. Refractive error blindness;Dandona R;Bull World Health Organ,2001
5. United Nations.World population prospects 2019 Volume II: demographic profiles. Available from:https://population.un.org/wpp/Graphs/1_DemographicProfiles/Pakistan.pdf. Accessed 10 Apr 2021.