Other terms that have been used include dual sensory impairment, hearing and vision loss, concomitant hearing and vision loss and hard of hearing/visually impaired. The term, stated in the IDEA refers to a continuum from hard of hearing to complete deafness and visually impaired to totally blind. Very few people are completely deaf and completely blind. Many students with deafblindness have additional disabilities.
Tim Poore, Consultant of the Deaf/Hard of Hearing