1) Architectural openings 2) Circular openings 3) Circular windows 4) Dome openings 5) Dome-top openings 6) Eye-shaped openings 7) Eyelike designs 8) Eyelike openings 9) Eyelike parts 10) Eyelike windows 11) Eyes 12) Features of Byzantine domes 13) Latin eyes 14) People see right through them 15) Round openings in a dome Found on https://www.crosswordclues.com/clue/oculi