Author:
Ding Yujie,Hou Min,Liu Liangping,Mao Yan,Liu Xing,Wu Mingxing
Abstract
Purpose:
To evaluate the role of a new parameter, iris root depth (IRD), in intraocular lens power calculation using ultrasound biomicroscopy (UBM) in primary angle-closure diseases (PACDs), and to compare the accuracy of 6 formulas in PACDs: Barrett Universal II (BUII), Haigis, Hill-Radial Basis Function (RBF) v. 3.0, Hoffer Q, Kane and Sanders Retzlaff Kraff/Theoretical (SRK)/T.
Setting:
Zhongshan Ophthalmic Center, Guangzhou, China.
Design:
Retrospective consecutive case series.
Methods:
Patients diagnosed with PACDs who had undergone cataract surgery were reviewed to first evaluate the performance of 6 formulas. Then preoperative UBM examinations of 58 eyes were used to measure IRD and predict effective lens position (ELP) to generate the HaigisIRD formula. The accuracy of HaigisIRD was compared with BUII, Haigis and Kane formulas. The SD of predicted error was the main indicator evaluating formula performance, according to heteroscedastic analysis.
Results:
103 eyes (103 patients) were included. The SDs of Kane (0.59, P = .01), RBF 3.0 (0.61, P = .02) and SRK/T formula (0.62, P = .04) were significantly lower than Hoffer Q. Modified with IRD, HaigisIRD generated the lowest SD (0.41), which was significantly lower than Haigis formula (0.54, P = .03) and was equal to Kane formula (0.45, P = .37).
Conclusions:
Kane, RBF 3.0 and SRK/T were more accurate in PACD eyes. Optimized with IRD, HaigisIRD formula achieved the lowest SD and had comparable accuracy with Kane formula. IRD could be a promising parameter to improve accuracy of IOL power calculation for PACDs.
Publisher
Ovid Technologies (Wolters Kluwer Health)
Subject
Sensory Systems,Ophthalmology,Surgery
Cited by
2 articles.
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