Monocle

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Von Weich uses his monocle to implant suggestions into Lieutentant Lucke's mind. (TV: The War Games)

A monocle was a type of glass lens used for only one eye.

The First Doctor used a monocle when he encountered the Sensorites, (TV: The Sensorites) Fomal, (PROSE: The Sons of the Crab), the Korads (PROSE: Peril in Mechanistria), the Voord (PROSE: The Fishmen of Kandalinga) and the Testimony Foundation. When visiting the space museum, he used it to inspect a piece of technology. (TV: "The Dimensions of Time"). While in the ruins of Villengard , he used his monocle to examine a discarded eyestalk (TV: Twice Upon a Time), whereas

A monocle was still in the pockets of the Second Doctor. (AUDIO: The Last Day at Work)

The War Lord von Weich used a monocle to implant suggestions into the minds of his human subordinates. (TV: The War Games)

The Seventh Doctor wore a monocle as part of his Reichsinspektor General guise. (PROSE: Timewyrm: Exodus)

Seth Rakoff wore a monocle. (COMIC: The Curse of the Scarab)

The computer Gus used the image of a monocle as its avatar. (TV: Mummy on the Orient Express)