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ACCURACY OF INTRAOCULAR LENS POWER ESTIMATION IN EYES HAVING PHACOVITRECTOMY FOR RHEGMATOGENOUS RETINAL DETACHMENT

Rahman, Rubina FRCOphth, FRCS*; Bong, Chun Xiao MBChB*; Stephenson, John PhD

doi: 10.1097/IAE.0000000000000072
Original Study
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Purpose: To evaluate the accuracy of intraocular lens power estimation in eyes having phacovitrectomy for rhegmatogenous retinal detachment.

Methods: Retrospective case review of 100 consecutive eyes that underwent phacovitrectomy for rhegmatogenous retinal detachment. Axial lengths were measured using optical biometry and/or ultrasound A-scan. Achieved and predicted refraction were compared to calculate the mean postoperative refractive prediction error and the mean absolute prediction error. Factorial analysis of variance models were developed to assess outcome on the whole and that between the subgroups.

Results: Ninety-five eyes had postoperative refraction: 41 macula-on (43%) and 54 macula-off (57%). The mean postoperative prediction error was −0.34 ± 0.89 diopters. There was no statistical significant difference in the refractive outcomes between macula-on and macula-off groups (P > 0.05). Overall, using mean absolute prediction error as the outcome measure, optical biometry was more accurate than ultrasound (P = 0.040). However, significantly more ultrasound-measured axial lengths were selected for intraocular lens power estimation in macula-off group compared with the macula-on group (P = 0.016).

Conclusion: Combined phacovitrectomy in rhegmatogenous retinal detachment included a small biometric error that was within the tolerable range in most cases. Both optical biometry and ultrasound should be used to estimate axial lengths, for macula-off rhegmatogenous retinal detachment cases, to improve the accuracy of intraocular lens power calculation.

Combined phacovitrectomy as primary repair for rhegmatogenous retinal detachment included a small biometric error that was within the tolerable range in most cases. The biometry used for intraocular lens power selection must be checked by comparing it with the fellow eye and the known refraction, especially in cases of macula-off rhegmatogenous retinal detachment.

*Department of Ophthalmology, Calderdale and Huddersfield NHS Foundation Trust, West Yorkshire, United Kingdom; and

School of Human and Health Sciences, University of Huddersfield, West Yorkshire, United Kingdom.

Reprint requests: Rubina Rahman, FRCOphth, FRCS, Calderdale and Huddersfield NHS Foundation Trust, West Yorkshire, United Kingdom; e-mail: rubina.rahman@nhs.net

Presented orally at the British and Eire Association of Vitreoretinal Surgeons Annual Meeting (BEAVRS), Canterbury, United Kingdom, November 9–11, 2011.

None of the authors have any financial/conflicting interests to disclose.

© 2014 by Ophthalmic Communications Society, Inc.