Sphere powers range
+16.75D to-19.00D, with minimum reading 0.25D or 0.12D
Cylinder powers range
0 to-6.00D, with minimum reading 0.25D or 0.12D
Astigmatic axis scale
0°to 180°,each step is 5°
Cross cylinder
±0.25D, reversal type, also can select ±0.50D
Interpupillary adjustment
50mm to 80mm, each step is 1mm
Forehead rest adjustment
16mm backward and forward
Effective visual range
19mm