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Measurement Mode K/R mode Continuous Keratometry & Refractometry Ref mode Refractometry Ker mode Keratometry CLBC mode Contact lens base curve measurement Refractometry Vertex Distance (VD) 0, 10 , 12, 13.5, 15mm Sphere (SPH) -25.00~+22.00d (VD= 12mm)[012. 0.25d] Cylinder (CYL) 0.00~+/- 10.00d (012. 0.25d)..