prism diopter

13 LETTERS · STARTS WITH P

prism diopter is a valid 13-letter word worth 19 points in Scrabble and 22 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1I1S1M3D2I1O1P3T1E1R1

3 + 1 + 1 + 1 + 3 + 0 + 2 + 1 + 1 + 3 + 1 + 1 + 1 =19 PTS

DOUBLE WORD → 38TRIPLE WORD → 57

MEANING

What does prism diopter mean?