Vertex Distance Calculator
<Beta>
Converts an Rx from one vertex distance to another using per‑meridian effective power.
Input Rx
Sphere (D): *
Cylinder (D):
Vertex Distances
From vertex (mm):
To vertex (mm):
Spectacles → Cornea (12 → 0)
Cornea → Spectacles (0 → 12)
Rounding
Power rounding:
0.25 D
0.125 D (1/8)
Compute
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