Hand-held optical device placed in front of the eyes to aid vision testing.

Hand-held optical device placed in front of the eyes to aid vision testing.

TRIAL RING - 10 DIOPTER

TRIAL RING - 12 DIOPTER

TRIAL RING - 15 DIOPTER

TRIAL RING - 2 DIOPTER

TRIAL RING - 20 DIOPTER

TRIAL RING - 25 DIOPTER

TRIAL RING - 2 DIOPTER NO HANDLE

TRIAL RING - 3 DIOPTER

TRIAL RING - 30 DIOPTER

TRIAL RING - 35 DIOPTER

TRIAL RING - 3 DIOPTER NO HANDLE

TRIAL RING - 4 DIOPTER

TRIAL RING - 40 DIOPTER

TRIAL RING - 4 DIOPTER NO HANDLE

TRIAL RING - 5 DIOPTER

TRIAL RING - 5 DIOPTER NO HANDLE

TRIAL RING - 6 DIOPTER

TRIAL RING - 8 DIOPTER

SET, LENS, TRIAL, FRESNEL PRISM, 2 - 10 DIOPTER

SET, LENS, TRIAL, FRESNEL PRISM, NO HANDLES, 2 - 10 DIOPTER

SET, LENS, TRIAL, FRESNEL PRISM, 12 - 40 DIOPTER

SET, LENS, TRIAL, FRESNEL PRISM, NO HANDLES, 12 - 40 DIOPTER