Television is an important means of obtaining information and sharing in the culture of this society. Because it is primarily a visual medium, blind and visually impaired people have not had full access to it. In 1990, after five years of research and development, a national service became available over the Public Broadcasting Service that makes television accessible to blind and visually impaired viewers. Developed by WGBH-TV in Boston, Descriptive Video Servicesm provides narrated descriptions of the key visual elements of television programs without interfering with their audio or dialogue.
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