Forehead

A forehead was a body part.

After Davros lost his vision, he used a blue lens on his forehead to see, similar to a Dalek eyestalk. (TV: Genesis of the Daleks, The Witch's Familiar, et al.) He was also capable of opening his true eyes, at least later in life, though he seldom made use of this ability. (TV: The Witch's Familiar)