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Refractive Measurement Range Spherical Value(S) : -30D ~ +25D (step : 0.12/0.25D) Cylindrical Value(C) : 0 ~ ±10D (step : 0.12/0.25D) Axis (A) : 0° ~ 180° (step : 1° ) Measurement Accuracy Spherical Value between ±10D : ±0.25D Beyond ±10 ∶ ±0.5D ..