Definition of Deaf-Blindness - American Association of the Deaf-Blind.

HKNCA: Helen Keller National Center for Deaf-Blind Youths and Adults – 2005

In the Dark About People Who are Deaf-Blind? by the Helen Keller National Center.

Statistics and Sources for Professionals – American Foundation for the Blind

Statistics: Deaf-Blind in the U.S. from Gallaudet University

Vision Impairment and Hearing Loss Among Commnity-Dwelling Older Americans: Implications for Health and Functioning