Spoilers for Only in death READ AT YOUR OWN RISK
My eyes, as you have guessed, are augmetics. They were put out by the Blood Pact after I was captured by their Chaos cultists. I was rescued by two of my men, Mkoll and Ezrah Night, after the Pact had managed to flay me and burn my eyes out with a poker.
They can see in several spectrums including low-light. Your turn, I believe.