1. Official Records of the World Health Organization: Preamble to the Constitution of the World Health Organization as adopted by the International Health Conference, New York, 19–22 June, 1946; signed on 22 July 1946 by the representatives of 61 States. 1948, 2-100. and entered into force on 7 April
2. Lee DJ, Lam BL, Arora S, Arheart KL, McCollister KE, Zheng DD, Christ SL, Davila EP: Reported eye care utilization and health insurance status among US adults. Arch Ophthalmol. 2009, 127 (3): 303-310. 10.1001/archophthalmol.2008.567.
3. Adhikari S, Paudel N, Adhikari P, Shrestha GS, Shrestha JB: Screening preschool children for visual disorders: A pilot study. Optom Vis Perf. 2013, 1 (6): 202-207.
4. Centers for Disease Control and Prevention (CDC): Vision health initiative: Common eye disorders. Atlanta, GA: Author. 2013, Online at:
http://www.cdc.gov/visionhealth/basic_information/eye_disorders.htm
Accessed 01/07/2013
5. Kragha IK: Eye diseases in northern Nigeria: prevalence, age and sex differences. Ophthalmic Physiol Opt. 1987, 7 (4): 481-483. 10.1111/j.1475-1313.1987.tb00782.x.