What is the cause of deaf-blindness and how many people are affected?

There is not a single cause for deafblindness. In fact, deafblindness has over 70 known causes. Regardless of the cause, the challenges of deafblindness are lifelong. Appropriate education must address both the hearing and vision impairments, as well as any other disabilities that may be present. This condition affects over 9,000 children between birth and 21 years of age in the United States.

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