Accuracy of Intraocular Lens Calculation Formulas

作者：Melles, Ronald B.^*; Holladay, Jack T.; Chang, William J.

来源：Ophthalmology, 2018, 125(2): 169-178.

DOI：10.1016/j.ophtha.2017.08.027

• BIOMETRY
• SRK/T
• EYES

Purpose: To compare the accuracy of intraocular lens (IOL) calculation formulas (Barrett Universal II, Haigis, Hoffer Q, Holladay 1, Holladay 2, Olsen, and SRK/T) in the prediction of postoperative refraction using a single optical biometry device. @@@ Design: Retrospective consecutive case series. @@@ Participants: A total of 13 301 cataract operations with an AcrySof SN60WF implant and 5200 operations with a SA60AT implant (Alcon Laboratories, Inc., Fort Worth, TX). @@@ Methods: All patients undergoing cataract surgery between July 1, 2014, and December 31, 2015, with Lenstar 900 optical biometry were eligible. A single eye per patient was included in the final analysis, resulting in a total of 18 501 cases. We compared the performance of each formula with respect to the error in predicted spherical equivalent and evaluated the effect of applying the Wange-Koch (WK) adjustment for eyes with axial length >25.0 mm on 4 of the formulas. @@@ Results: For the SN60WF, the standard deviation of the prediction error, in order of lowest to highest, was the Barrett Universal II (0.404), Olsen (0.424), Haigis (0.437), Holladay 2 (0.450), Holladay 1 (0.453), SRK/T (0.463), and Hoffer Q (0.473), and the results for the SA60AT were similar. The Barrett formula was significantly better than the other formulas in postoperative refraction prediction (P < 0.01) for both IOL types. Application of the WK axial length modification generally resulted in a shift from hyperopic to myopic outcomes in long eyes. @@@ Conclusions: Overall, the Barrett Universal II formula had the lowest prediction error for the 2 IOL models studied.

• 出版日期2018-2