Box comprising a horizontal and a vertical prism bar and two additional prisms of 45 and 30 diopters.
Veritcal prism bar, with the following diopters: 1 / 2 / 3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20 / 25D and an additional prism of 30D.
