Many people are familiar with closed captioning, the means by which the dialogue and sound effects of a film or television program are made visible via on-screen text. However, description, for viewers who are blind or have low vision, is less familiar. Descriptive narration conveys the key visual aspects of a film or television program by describing scenery, facial expressions, costumes, and so on during natural pauses in dialogue. For a seriously very good explanation about descriptive narration, check the American Council of the Blind's very comprehensive report from their Audio Description Project.
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