In zoology|lang=en terms the difference between diopsid and dioptid
is that diopsid is (zoology) any member of the diopsidae while dioptid is (zoology) any member of the dioptidae.
As nouns the difference between diopsid and dioptid
is that diopsid is (zoology) any member of the diopsidae while dioptid is (zoology) any member of the dioptidae.