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Haigis-L Formula - Post Hyperopic LASIK.

The Haigis-L Formula1.

Using an IOLMaster corneal radius measured in mm, the hyperopic version of the Haigis-L algorithm generates a corrected corneal radius, which is then used by the regular Haigis formula to calculate the IOL power.

 

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This corrected, average corneal power in keratometric diopters is then used with the regular Haigis formula to calculate the power of the intraocular lens.

In essence, what the hyperopic version of the Haigis-L formula does is begin with a small intermediate area and then correct it based on a regression-derived algorithm. If this corrected central corneal power is then entered into the regular Haigis formula, it will do a good job with the calculation. This is due to the fact that the Haigis formula does not tie the effective lens position estimation to the central corneal power. This dependence on the central corneal power for the effective lens position calculation is one of the drawbacks of older, 2-variable, 3rd generation IOL power calculation formulas, such as SRK/T, Holladay 1 and Hoffer Q, which require an Aramberri double-K method correction to remove the artifact generated by a falsely flat central cornea.

For the IOL power determination, the hyperopic version of Haigis-L and the Haigis formula are actually the same. The only difference between the two is that the hyperopic version of Haigis-L first calculates a new corneal radius based on the myopic Haigis-L algorithm.

The hyperopic version of the Haigis-L formula is now available on the most recent IOLMaster software and also at the ASCRS on-line post-keratorefractive IOL power calculator at iol.ascrs.org

References

1. Haigis W, Lege BAM, Neuhann TF: Bestimmung wirksamer Hornhautradien nach hyperoper LASIK. Fortschritte der Ophthalmochirurgie (A.Scharrer, A.Reuscher, Th..Neuhann (Hrsg), 18.Kongress der Deutschen Ophthalmochirurgen. Diomed-Verlag, Ebelsbach, p.95, 2005.


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IOL Power Calculations After Keratorefractive Surgery

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East Valley Ophthalmology
5620 East Broadway Road
Mesa, Arizona 85206

Tel: +1-480-981-6111
FAX: +1-480-985-2426

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