Cataracts. National Eye Institute. National Institutes of Health website. Available at:
http://www.nei.nih.gov/health/cataract. Updated May 2009. Accessed July 13, 2009.
National Institutes of Health.
Ophthalmic Genetics Newsletter.
American Academy of Ophthalmology
National Eye Institute, NIH
The College of Family Physicians of Canada
Canadian Ophthalmological Society