RM-100 Auto Refractor [ Technical parameter ] Vertex distance(VD) 0.0,12.0,13.75 Spherical surface -20.0020.00When VD is 12mm. Variable0.12D Cylinder(CYL) 0.00±8.00D variable:0.12D Shaft position 1180variable1 Astigmatism identification ,,± Pupil distance(PD) 4585mm Measurable minimum of pupil 2.5mm Data records three times records per eye Built-in printer thermo-sensitive linearity printer Power supply AC 200240V Dimension Over 485L×280W×440Hmm Weight Approximately 20kg