Type:Ophthalmic Optical Equipments Product name:NIDEK Japan Auto Ref Keratometer Sphere:-0.25D ~ +22.00D Cylinder:0.00D ~ _10.00D Pupil Distance (PD):10mm ~ 85mm Minimum Pupil diameter:2mm Radius of Curvature:5.0mm ~ 10.2mm Corneal Power:33.00D ~ 67.50D Corneal Astigmatism:0.00mm ~ 15.0mm Measurable Pupil/Iris Size:2.0mm ~ 14.00mm Memory Data:10 for each eye Show More