Refractive products

Specifications
refractive measuring range:
spherical (s) : measurement range -30d - +22d (vd=12)
-22d - +22d (vd=0)
unit 0.12, 0.25d
cylinder (c) : measurement range -0d - ± 10d
0.12, 0.25 d (switching)
symbol - , + , +(switching)
axis (a) : measurement range 0 degree- 180 degree
unit 1 degree
vertex distance 0, 10, 12, 13.5, 15 mm