viewer

noun
  1. A person who watches television, a film, or another form of visual media. noun
    The show attracted millions of viewers worldwide.
    As a viewer, she found the documentary both informative and moving.
  2. A device or apparatus used for viewing slides, photographs, or other visual materials. noun
    He used a slide viewer to look at his vacation photos.
    The museum provided a viewer for visitors to examine the ancient manuscripts.
  3. A person who looks at or inspects something. noun
    The art gallery was filled with viewers admiring the new exhibition.
    As a viewer of the crime scene, the detective took detailed notes.