Audio description
Audio description, also referred to as a video description or more precisely called a visual description, is an additional narration track intended primarily for blind and visually impaired consumers of visual media (including television and film, dance, opera, and visual art). It consists of a narrator talking through the presentation, describing what is happening on the screen or stage
during the natural pauses in the audio, and sometimes during dialogue if deemed necessary.
For the performing arts (theater, dance, opera), and media (television, movies and DVD), description is a form of audio-visual translation, using the natural pauses in dialogue or between critical sound elements to insert narrative that translates the visual image into a sense form that is accessible to millions of individuals who otherwise lack full access to television and film. Occasionally when there is dialogue that is in another language from the main one of the film and subtitled on screen, the subtitles are read in character by the describer.