Crossword puzzle clue "eyeglass frames"

a piece of transparent matter with one or both surfaces curved to cause regular convergence or divergence of rays passing through it

CEL, (short for) celluloid, a celluloid frame of an animated cartoon

MAT, to tangle closely

having two focal points

a measure of refractive power, also DIOPTRE

(French) a small ornamental case for holding e.g. needles, also ETWEE