Monochrome

Monochrome was the term relating to a single colour or hue.

Haemovariforms' vision was monochromatic. (TV: Tooth and Claw)

The Doctor's first two incarnations had monochromatic vision; the War Doctor mused over this after noticing the new colour balance in his eyes shortly after his regeneration. (PROSE: The Day of the Doctor) In another account, the Third Doctor recalled noticing the colours of the rocks on Gallifrey in his first incarnation after meeting a hermit on the mountainside. (TV: The Time Monster)