Visual circuit
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A visual circuit, or vision circuit, was, broadly speaking, a technological component which allowed for vision.
In the 40th century, the android Mark Seven was equipped with a vision circuit which was infraspectrum sensitive. (AUDIO: The Destroyers)
A grey Dalek used a visual circuit as means of sight. During the Dalek-Movellan War, the Fourth Doctor used his hat to block such a Dalek's eyestalk, impairing its visual circuit. (TV: Destiny of the Daleks)
A different visual circuit was used as a monitor in the office of Tobias Vaughn at International Electromatics. (TV: The Invasion)
