Reviewed by Alan Kozarsky on October 18, 2016
https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072432/<br /><br />https://nei.nih.gov/health/healthyeyes<br /><br />http://www.aoa.org/patients-and-public/resources-for-teachers/how-your-eyes-work?sso=y<br /><br />https://nei.nih.gov/health/uveitis/uveitis<br /><br />http://www.mayoclinic.org/diseases-conditions/uveitis/basics/causes/con-20026602
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