1. Vision Screening in School Children - A comprehensive school screening manual - A VISION. The Right to Sight - India Publication; 2020.
2. General R. Census Commissioner: Census of India. Rural urban distribution of population (Provisional Population Totals); 2011. Accessed July 25, 2020. http://censusindia.gov.in
3. Prevalence of refractive errors in children in India: a systematic review
4. Government of Tamil Nadu. About Tamil Nadu. National informatics centre. Accessed July 25, 2020. https://www.tn.gov.in/tamilnadustate
5. Huisman AH, Rani U, Smits JP School characteristics, socio-economic status and culture as determinants of primary school enrolment in India. Nijmegen Centre for Economics (NiCE) Working Paper. Nijmegen, Radboud University; 2010; 10109: p.34. Accessed on July 25, 2020. https://www.ru.nl/nsm/imr/vm/research-centres/nijmegen-centre-economics-nice/nice-working-papers/