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Abstract
To describe the Haigis-L formula for the calculation of intraocular lenses (IOLs)
after refractive laser surgery for myopia based on current biometry and keratometry
and present clinical results.
University Eye Hospital, Wuerzburg, Germany, and various clinics and private practices.
The basic concepts of the new algorithm were described and summarized. The Haigis
formula was analyzed with respect to its usability for eyes after laser surgery for
myopia and modified accordingly. Correction curves for IOLMaster keratometry were
derived from previous studies. The new formula was checked using the postoperative
results of 187 cataract procedures in which 32 IOL types were implanted by 57 surgeons.
Input data were current IOLMaster biometry as follows: axial length (AL), anterior
chamber depth (ACD), and keratometry (corneal radii) measurements.
Before IOL surgery, the mean spherical equivalent was -7.60 diopters (D)+/-3.90 (SD)
(range -20.00 to -1.25 D); the mean AL, 27.02+/-2.01 mm (range 23.09 to 35.32 mm);
the mean ACD, 3.52 +/- 0.36 mm (range 2.43 to 4.39 mm); and the mean of the measured
corneal radii, 8.70+/-0.60 mm (range 7.28 to 10.96 mm). The mean arithmetic refractive
prediction error was -0.04+/-0.70 D (range -2.30 to +2.40 D) and the median absolute
error, 0.37 D (range +0.01 to +2.40 D). The percentages of correct refraction predictions
within +/-2.00, +/-1.00, and +/-0.50 D were 98.4%, 84.0%, and 61.0%, respectively.
The new formula would produce promising results in eyes without refractive history.
Its refractive predictability fulfills the current criteria for normal eyes.