1. Center for Disease Control and Prevention. Vision impairment and blindness. 2018. Retrieved from: https://www.cdc.gov/visionhealth/vehss/data/studies/vision-impairment-and-blindness.html#:~:text=**Blindness%20is%20defined%20by,of%2020%2F200%20or%20worse. Accessed 11 Nov 2020.
2. WHO. Blindness and vision impairment. 2020. Retrieved from: https://www.who.int/health-topics/blindness-and-vision-loss#tab=tab_1. Accessed 11 Nov 2020.
3. WHO. Visual impairment and blindness. Fact Sheet N°282. 2020. Retrieved from: http://www.who.int/mediacentre/factsheets/fs282/en/. Accessed 10 Nov 2020.
4. Center for Disease Control and Prevention (CDC). Blindness and vision impairment. 2020. Retrieved from:https://www.cdc.gov/healthcommunication/toolstemplates/entertainmented/tips/Blindness.html. Accessed 10 Nov 2020.
5. Ishtiaq R, Chaudhary MH, Rana MA, Jamil AR. Psychosocial implications of blindness and low vision in students of a school for children with blindness. Pak J Med Sci. 2016;32(2):431–4.