Refractometer Vertex Distance : 0.0, 12.0, 13.75, 15..
Refractometer Sphere Power : -20.00 ~ +20.00D (in..
Refractometer Cylinder Power (cyl) | : -0.00 ~ +- 10.00D (0..
Refractometer Axis (ax) : 0 ~ 180 (1 UNIT)
Refractometer Pupil Distance (pd) : 10 ~ 85MM