1. National Eye Institute, Prevalence of Blindness and Low Vision Among Adults Aged 40 Years and Older in the United States (National Eye Institute, Bethesda, MD, 2004), Accessed July, 2006, at http://www.nei.nih.gov/eyedata/pbd_tables.asp
2. Centers for disease control (CDC), Diabetes Surveillance System (2003), CDC Accessed July, 2006, at http://www.cdc.gov/diabetes/statistics/index.htm
3. A.H. Mokdad, E.S. Ford, B.A. Bowman, D.E. Nelson, M.M. Engelgau, F. Vinicor, J.S. Marks, Diabetes Care, 23, 1278–1283 (2000)
4. American Optometric Association, Optometric Clinical Practice Guideline: Care of the Patient with Diabetes Mellitus: Reference Guide for Clinicians, Third Revision (2002), Accessed May, 2006, At: http://www.aoa.org/documents/CPG-3.Pdf
5. American Diabetes Association: Clinical Practice Recommendations (2002). The Expert Committee on the Diagnosis and Classification of Diabetes Mellitus, Diabetes Care 25, S1–S147 (2002)