Viewers or monitors were the optical and visual devices and screens used aboard starships, such as viewscreens and scopes. "Viewer" was a general term for equipment found among numerous races. Viewers came in a variety of sizes, from desktop units to wall-mounted versions such as those commonly found on the main bridge of a starship. Some viewers were equipped to generate three-dimensional images. (TOS: "Where No Man Has Gone Before")

Viewers were also found in bars and restaurants such as in the Café des Artistes in Paris on Earth. (TNG: "We'll Always Have Paris")

NX-class starships also featured viewers in the ship's galley and in the pantry. (ENT: "The Catwalk")

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