Comparison of Refractive Outcomes Assessed by the IOL Power Calculation SRK/T and Haigis Formulas in Eyes With Long Axial Lengths

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  • 長眼軸眼の眼内レンズ挿入術後屈折誤差に関するＳＲＫ／Ｔ式とＨａｉｇｉｓ式の比較

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Purpose: The eye with long axial length (AL) tends to have greater refractive error after cataract surgery than the eye with normal AL. We compared the accuracy of SRK / T formula with Haigis, which is third generation formula.<BR>Sublects & Methods: One hundred seventy eyes of 121 patients with AL equal or more than 26.00 mm, best corrected visual acuity equal or more than 1.0, were enrolled in the study. Axial length, keratometry, and anterior chamber depth were measured using IOL MasterTM before cataract surgery. All eyes were followed more than 3 month after surgery. Eyes were divided into two groups according to the AL (Group L; 26.00 mm ≤ AL < 28.00 mm, Group XL; AL ≥28.00 mm). Then the difference between intended and achieved refraction were evaluated using SRK / T or Haigis formula. <BR>Results: The postoperative refractive error in L and XL group were predicted correctly within±1.0D in 95.5 % and 82.8 % respectively using SRK / T, and 92.0 % and 84.5 % respectively using Haigis. There was no statistically significanct difference between SRK/T and Haigis formula(p>0.05, Chi-Square Test). In the eye with AL longer than 30.00 mm, the refractive error when Haigis formula was used was smaller than that of SRK / T (p < 0.05, Wilcoxon signed rank test), however approximately 1.0 D hyperopic shift was observed using either SRK / T or Haigis.<BR>Conclusion: There were no statistical differences regarding postoperative refractive error even if either SRK / T or Haigis formula was used. We need to consider hyperopic shift in the eye with AL longer than 30.00 mm.

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