Deafblindness (or deaf-blindness) is the condition of a person who is both deaf and blind. It can be capitalized to indicate that it is a culture.
Deafblind people face challenges and issues unique from those of people who are only Deaf or Blind and not both. The most notable Deafblind person is Helen Keller, who became a well-known author, activist and lecturer.
Deafblind people communicate in many different ways. For example, in the United States, many deafblind people who grew up deaf and experienced vision loss later in life use American Sign Language with tactile or visual modifications.
Communication with Deafblind people also uses manual alphabets. Examples are the Deafblind Manual Alphabet (touching a Deafblind person's hand in special ways signifies letters) or the Block Alphabet (also known as the Spartan Alphabet), in which one traces capital letters of the Latin alphabet in the palm of a Deafblind person's hand.
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The term "deafblind" refers to a combination of a vision impairment with a hearing impairment that affects the way a student is able to access information and function in the educational environment.
Additionally, if a student with deafblindness requires extensive and novel modifications to the existing educational model, the services of an intervener can be used to simplify the process for the other members of the educational team.
Because a student who is deafblind misses significant environmental information, he or she may not have as complete a conceptual understanding of topics being discussed as someone who has complete use of one or both distance senses.