Crossword clues for the word: DIOPTER The word DIOPTER has appeared as an answer to at least 6 crossword clues on different crossword puzzles. Crossword clues for DIOPTER Showing 1 to 6 of 6 results Clue(s) Ancient astronomy device Eyeglass prescription measurement Oculist's unit. Optometrist's unit Unit of optical power of a lens Unit of refractive power of a lens