Estimates the correction needed for an IOL calculated with standard biometry after corneal laser ablation — using separate, established methods rather than a single rule-of-thumb model.
Not a validated medical device. This tool does not replace a primary post-refractive calculation
(Barrett True-K „No History“, Haigis-L, Shammas-PL, EVO 2.0, the ASCRS Online Calculator or ray tracing).
It provides a plausibility estimate of how much an IOL already calculated with a standard formula would need to
change — for collegial cross-validation, not as a sole basis for the decision.
Always cross-check. If you have access to them, always compare this calculator’s results
with the Haigis-L formula and other formulas, or with Barrett True-K „No History“ or EVO 2.0.
1Starting point — what the standard formula „saw“
The post-op measured K that fed the standard calculation. After myopic ablation it is too high (posterior-surface error).
Correctly measured post-op — does not enter the correction.
2Method for reconstructing the true corneal power
All available methods are shown side by side. The headline uses the selected method or the mean (ASCRS principle).
Rule of thumb ≈ 0.8–1.0. Does not replace a true vergence calculation.