Wiktionary
eyeslit
n. A slit for looking through, as in a castle wall or a helmet.
Usage examples of "eyeslit".
She squinted through the eyeslit, but found that everything wavered as if seen through a blowing mist.
He watched the dark eyeslits narrowing with greed till her eyes were green stones.
Craer promptly wrapped his legs around the head of that knight-a foe who was dead before crashing to the ground, as Overduke Delnbone rode the enemy armaragor down to the marble, sinking daggers into throat and back of neck and eyeslits in a snarling fury.
Whether he intended to hack off Gregor's head or shove the point through his eyeslit was something Tyrion would never know.