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3. Refractive Errors and Refraction - How the Eye Sees. (n.d.). Retrieved May 17, 2015 from http://www.allaboutvision.com/eye-exam/refraction.htm
4. Eyes-Laser Eye Surgery|Better Health Channel. (n.d.). Retrieved May 17, 2015 from http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Eyes_laser_eye_surgery
5. About Refractive Errors | National Eye Institute. (n.d.). Retrieved May 17, 2015 from https://www.nei.nih.gov/health/errors/errors
6. McElligott, E., Farrag, L., & Dombrowski, T. (2005, April 29). Laser Eye Surgery. Retrieved May 17, 2015 from www.unc.edu/~lfarrag/
7. History of LASIK laser eye surgery. (n.d.). Retrieved May 17, 2015 from http://www.lasikmd.com/toronto/procedures-technology/procedures/history-of-lasik
8. Laser Eye Surgery. (n.d.). Retrieved May 17, 2015 from http://healthycanadians.gc.ca/drugs-products-medicaments-produits/procedures/surgery-chirurgie-eng.php
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13. [Photograph]. Retrieved from http://www.boydvision.ca/pics/lasik-standard-correction-LRG.jpg