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Vertex Distance Power Conversion Calculator — result sheet
Convert an optical power between two vertex planes using the thin-lens vertex-distance relation.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Fnew = Fold/[1 + (dnew − dold)Fold], with vertex distances converted to metres.
The calculator applies a sign-consistent vergence conversion between two lens planes and reports the entered plane change explicitly.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Power at original plane — D; minimum -1000; maximum 1000
- Original vertex distance — mm; minimum -1000; maximum 1000
- New vertex distance — mm; minimum -1000; maximum 1000
Worked example
| Input | Value |
|---|---|
| Power at original plane | -4 |
| Original vertex distance | 12 |
| New vertex distance | 0 |
The converted power is about −3.82 D.
Assumptions and limits
- Power is spherical-equivalent optical power in dioptres and both distances use the same reference convention.
- The lens is treated as a thin paraxial element with no cylinder, prism, aberration, or fitting adjustment.
- This arithmetic does not prescribe lenses, replace refraction, or validate a clinical prescription.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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