Individual hand-held prism flippers. The orientation of these flippers is in base-in and base-out.
Lens Types are:
1 Diopter (1^+1^) = 2^ total ( 137001)
2 Diopter (2^+2^) = 4^ total ( 137002)
3 Diopter (3^+3^) = 6^ total ( 137003)
4 Diopter (4^+4^) = 8^ total ( 137004)
6 Diopter (6^+6^) = 12^ total ( 137006)
8 Diopter (8^+8^) = 16^ total ( 137008)