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Astigmatism fan dial
Astigmatism fan dial with fine radial meridian lines from 0 to 180 degrees, based on subjective refraction fan/sunburst dial principles and Sturm conoid optics.
Static read-only
Astigmatism fan dial with fine radial meridian lines from 0 to 180 degrees, based on subjective refraction fan/sunburst dial principles and Sturm conoid optics.