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BACKGROUND: To examine the effect of trabeculectomy on intraocular lens (IOL) power calculations in open-angle glaucoma (OAG) patients undergoing cataract surgery. DESIGN: Retrospective data analysis. PARTICIPANTS: A total of 55 eyes of 55 OAG patients who had a cataract surgery alone or in combination with trabeculectomy. METHODS: We classified OAG subjects into the following groups based on surgical history: only cataract surgery (OC), cataract surgery after prior trabeculectomy (CAT), and cataract surgery performed in combination with trabeculectomy (CCT). MAIN OUTCOME MEASURES: Differences between actual and predicted postoperative refractive error. RESULTS: Mean error (ME, difference between postoperative and predicted SE) in the CCT group was significantly lower (towards myopia) than that of the OC group (p = 0.008). Additionally, mean absolute error (MAE, absolute value of ME) in the CAT group was significantly greater than in the OC group (p = 0.006). Using linear mixed models, the ME calculated with the SRK II formula was more accurate than the ME predicted by the SRK T formula in the CAT (p = 0.032) and CCT (p = 0.035) groups. CONCLUSIONS: The IOL power prediction accuracy was lower in the CAT and CCT groups than in the OC group. The prediction error was greater in the CAT group than in the OC group, and the direction of the prediction error tended to be towards myopia in the CCT group. The SRK II formula may be more accurate in predicting residual refractive error in the CAT and CCT groups. This article is protected by copyright. All rights reserved.
Department of Ophthalmology, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea.
Full article15 Miscellaneous
9.4.11.2 Glaucomas in aphakia and pseudophakia (Part of: 9 Clinical forms of glaucomas > 9.4 Glaucomas associated with other ocular and systemic disorders > 9.4.11 Glaucomas following intraocular surgery)