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.
Full spectacle Rx workup: vertex, transpose, SE, trial CL, estimated VA.
Convert between plus and minus cylinder form.
SE from sphere and cylinder, with quarter-step rounding.
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.
On-screen acuity chart calibrated to your monitor and distance.
Visual acuity from cycles per centimeter and distance.
Snellen ft/m, logMAR, decimal, MAR, and M units.
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, floaters, diplopia, scotoma, and more on an eye chart.
Meridional blur with adjustable axis and severity.
Drifting vitreous floaters, animated.
Flickering static across the visual field, animated.
Binocular and monocular double vision in any direction.
Central vision loss as in AMD, on chart or Amsler grid.
Color fringing from lens dispersion.
Wavy-line distortion on the Amsler grid.
Constricted fields as in glaucoma or RP.
Searchable eye-care ICD-10-CM codes (FY2027) with billable flags.
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