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Refraction Measurement Sphere – 25~+25D (0.01/0.12/0.25D Step) Cylinder 0~ ±10D (0.01/0.12/0.25D Step) Axis angle 0~180 (1 Step) Measurement Of Corneal Radius Corneal radius 5.0 ~ 10.0 mm (0.01 mm Step) Refractive power 33.75 ~ 67.5D (0.01/0.12/0.25D Step) ..