// multi-utility computation suite · offline · instant · precise
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health.vision-correction Calculator
Converts spectacle prescription between sphere-cylinder notation and spherical equivalent, and estimates contact lens power with vertex distance correction. Vertex distance correction is critical when converting from spectacle to contact lens prescription — a −10.00D Rx changes by ~1.00D at the corneal plane.
Inputs
Sphere
Reference formula or conversion factor shown for context.
Cylinder
Reference formula or conversion factor shown for context.
Axis
Reference formula or conversion factor shown for context.
Pd
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Results
spherical equivalent (D)
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
distance vision (m)
The computed distance or separation.
prescription
Sample size or count used in the calculation.
PD
Reference formula or conversion factor shown for context.
type
The classification or type assigned based on the inputs.