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Clinician: IOL calculation for hyperopic eyes best measured with Haigis, Hoffer Q formulas

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BERLIN — Selecting the best IOL power formula for hyperopic eyes can be key in IOL selection, an expert said here.

Wolfgang Haigis, PhD, said problems with IOL calculation in hyperopic eyes include lens position prediction errors, manufacturing tendencies for high-powered lenses and difficulties in selecting the appropriate IOL power formula. He presented a study conducted with Frank Goes, MD, examining power formulas for hyperopic eyes at the European Society of Cataract and Refractive Surgeons meeting.

"The best results for these hyperopic eyes were with Haigis and Hoffer Q," Dr. Haigis said. "Don't use SRK II and SRK/T for hyperopic eyes."

Ninety-one eyes of 50 hyperopic patients underwent IOLMaster (Carl Zeiss Meditec) biometry and refractive lens exchange with AcrySof SA60AT and SN60AT (Alcon) lenses. Patients had mean arithmetic and median absolute refraction prediction errors determined for IOL power formulas using the Haigis, Hoffer Q, Holladay 1, SRK/T and SRK II, said Dr. Haigis, who devised the Haigis formula.

Drs. Haigis and Goes found that medians of the absolute prediction errors were significantly different, including the absolute prediction errors of all combinations with SRK/T and SRK II.