IOL Calculator — iol-calculator

Axial length (AL, mm)

K1 (D)

K2 (D)

Axis (°)

Anterior chamber depth (ACD, mm)

Lens thickness (LT, mm)

Central corneal thickness (CCT, µm)

Age (years)

Target refraction (D)

IOL A-constant / Constants

For SRK/T enter A-constant (e.g., 119.0). For Haigis enter [a0,a1,a2] comma-separated if desired (e.g., 1.0,0.4,0.1)

Topography adjustment

Proprietary formulas: Kane and Barrett True-K are proprietary. This site provides placeholders to paste externally-obtained outputs or to integrate licensed APIs. Do not embed proprietary code without permission.

External licensed result (paste Kane/Barrett result here)

Results

SRK/T

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Haigis

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Holladay 2 (approx)

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SRK/T with topo-adjusted K

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External / Proprietary

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Notes

SRK/T and Haigis implementations here are simplified, educational approximations based on published methods.
Holladay 2 is approximated; full clinical implementation requires proprietary regression constants and multiple internal lookup tables.
For keratoconus, prefer topography-derived Ks (or Barrett True-K / Kane with permission).