Biometry accuracy using zero-and negative-powered intraocular lenses

被引:49
作者
MacLaren, RE [1 ]
Sagoo, MS [1 ]
Restori, M [1 ]
Allan, BDS [1 ]
机构
[1] Moorfields Eye Hosp, Vitreoretinal Serv, London, England
关键词
D O I
10.1016/j.jcrs.2004.04.054
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Purpose: To audit the accuracy of biometry using the SRK/T formula when negative- or zero-powered intraocular lenses (IOLs) are predicted and to compare the results between A-scan, B-scan, and optical methods of biometry. Setting: Moorfields Eye Hospital, London, United Kingdom. Methods: This retrospective analysis comprised 78 eyes of 54 patients having cataract surgery with zero- or negative- powered IOLs. Axial lengths were measured with A-scan, B-scan, applanation, or optical methods. Differences between SRK/T-predicted and actual postoperative refraction were analyzed for 75 eyes having cataract surgery. Ocular comorbidity, visual acuity, and biometry readings were also compared. Results: Forty-one percent of 75 patients analyzed were within +/- 1.00 diopter (D) of the predicted refraction, although there was a significant tendency toward a hyperopic overcorrection by 1.14 D (95% confidence interval, 0.89-1.39 D). This overcorrection error was consistent across all 3 biometry methods used to estimate axial length and increased with the use of stronger (more negative) IOLs. Conclusion: Surgeons should be aware of the tendency for negative-powered lenses to overcorrect and lead to a hyperopic outcome when using the SRK/T biometry formula in highly myopic eyes. A weaker-powered negative IOL is recommended to aim for a more myopic postoperative outcome by about 1.00 to 2.00 D.
引用
收藏
页码:280 / 290
页数:11
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