title: Accuracy of Intraocular Lens Power Formulas Involving 148 Eyes with Long Axial Lengths: A Retrospective Chart-Review Study.
abstract: Purpose. This study aims to compare the accuracy of intraocular lens power calculation formulas in eyes with long axial lengths from Chinese patients subjected to cataract surgery. Methods. A total of 148 eyes with an axial length of >26 mm from 148 patients who underwent phacoemulsification with intraocular lens implantation were included. The Haigis, Hoffer Q, Holladay 1, and SRK/T formulas were used to calculate the refractive power of the intraocular lenses and the postoperative estimated power. Results. Overall, the Haigis formula achieved the lowest level of median absolute error 1.025 D (P < 0.01 for Haigis versus each of the other formulas), followed by SRK/T formula (1.040 D). All formulas were least accurate when eyes were with axial length of >33 mm, and median absolute errors were significantly higher for those eyes than eyes with axial length = 26.01-30.00 mm. Absolute error was correlated with axial length for the SRK/T (r = 0.212, P = 0.010) and Hoffer Q (r = 0.223, P = 0.007) formulas. For axial lengths > 33 mm, eyes exhibited a postoperative hyperopic refractive error. Conclusions. The Haigis and SRK/T formulas may be more suitable for calculating intraocular lens power for eyes with axial lengths ranging from 26 to 33 mm. And for axial length over 33 mm, the Haigis formula could be more accurate.
authors.affiliation: Department of Ophthalmology, Shanghai Key Laboratory of Fundus Disease, Shanghai General Hospital Affiliated to Shanghai Jiao Tong University, Shanghai 200080, China.
authors.forename: Chong
authors.initials: C
authors.lastname: Chen
authors.affiliation: Department of Ophthalmology, Shanghai Key Laboratory of Fundus Disease, Shanghai General Hospital Affiliated to Shanghai Jiao Tong University, Shanghai 200080, China.
authors.forename: Xian
authors.initials: X
authors.lastname: Xu
authors.affiliation: Department of Ophthalmology, Shanghai Key Laboratory of Fundus Disease, Shanghai General Hospital Affiliated to Shanghai Jiao Tong University, Shanghai 200080, China.
authors.forename: Yuyu
authors.initials: Y
authors.lastname: Miao
authors.affiliation: Department of Ophthalmology, Shanghai Key Laboratory of Fundus Disease, Shanghai General Hospital Affiliated to Shanghai Jiao Tong University, Shanghai 200080, China.
authors.forename: Gaoxin
authors.initials: G
authors.lastname: Zheng
authors.affiliation: Department of Ophthalmology, Shanghai Key Laboratory of Fundus Disease, Shanghai General Hospital Affiliated to Shanghai Jiao Tong University, Shanghai 200080, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Department of Ophthalmology, Shanghai Key Laboratory of Fundus Disease, Shanghai General Hospital Affiliated to Shanghai Jiao Tong University, Shanghai 200080, China.
authors.forename: Xun
authors.initials: X
authors.lastname: Xu