Chairside and research tools: vertexing, prism, acuity conversions, etc.
Calculate contact lens power from a spectacle Rx.
Calculate a spectacle Rx from a contact lens Rx.
Calculate lens power given two vertex distances.
Convert between plus and minus cylinder form.
Convert neutralizing lenses and beam angle to plus/minus cyl.
Convert cm to Diopters and compare to Hofstetter's norms.
Visual acuity from letter size and distance.
Visual acuity from cycles per centimeter and distance.
Convert base curve units (mm and diopters) or use a chart.
Estimated residual astigmatism from corneal Ks.
Magnitude and orientation of oblique Fresnel prism.
Simulate astigmatism, cataract, diplopia, scotoma, and more on an eye chart.
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