Comparison of IOL Power Calculation Methods and Intraoperative Wavefront Aberrometer in Eyes After Refractive Surgery
- 1 July 2013
- journal article
- research article
- Published by SLACK, Inc. in Journal of Refractive Surgery
- Vol. 29 (7), 484-489
- https://doi.org/10.3928/1081597x-20130617-07
Abstract
Original Article Ana Paula Canto, MD; Priyanka Chhadva, BS; Florence Cabot, MD; Anat Galor, MD; Sonia H. Yoo, MD; Pravin K. Vaddavalli, MD; William W. Culbertson To compare preoperative methods for calculating intraocular lens (IOL) power versus the intraoperative wavefront aberrometer in eyes with a history of refractive surgery. A retrospective study of 46 eyes (33 patients) with previous refractive surgery that underwent subsequent cataract surgery was conducted. Suggested IOL power predicted by ORange intraoperative wavefront aberrometer (WaveTec Vision Systems, Inc., Aliso Viejo, CA) was compared to power predicted by the (1) SRK-T formula using keratometry and axial length measurements from the IOLMaster (Carl Zeiss Meditec, Dublin, CA), (2) average central keratometry (Avg K) from corneal topography, and (3) average IOL power predicted by the American Society of Cataract and Refractive Surgery (ASCRS) web site. No historical information was used for the calculations. IOL power required for emmetropia was back-calculated using manifest refraction and implanted IOL power after cataract surgery. Mean age was 60 ± 7.9 years. Fifteen percent had a history of myopic photorefractive keratectomy (n = 7), 57% myopic LASIK (n = 26), 13% hyperopic LASIK (n = 6), and 22% radial keratectomy (RK) (n = 10). In 37% of cases, ORange predicted IOL power to within ±0.50 diopters (D) of emmetropia, compared to 30% for IOLMaster keratometry, 26% for Avg K, and 17% for ASCRS web site. In eyes after myopic treatment, ORange, IOLMaster, Avg K, and ASCRS web site predicted within ±0.50 D of emmetropia in 39%, 27%, 24%, and 18%, respectively, and within ±1.0 D in 60%, 39%, 39%, and 51%, respectively. In eyes after RK, ORange, Avg K, and ASCRS web site predicted to within ±0.50 D of emmetropia in 14% and the IOLMaster in 43% cases. Although the ORange most often predicted to within ±0.5 D of emmetropia, no method was able to achieve this accuracy more than 50% of the time. Predictions for eyes after RK were worse than for other types of refractive procedures. [J Refract Surg. 2013;29(7):484–489.] From Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida (APC, PC, FC, AG, SHY, PKV, WWC); University of Miami Miller School of Medicine, Miami, Florida (PC); Miami Veterans Administration Medical Center, Miami, Florida (AG); and L. V. Prasad Eye Institute, Hyderabad, India (PKV). Supported by an unrestricted grant from Research to Prevent Blindness. The authors have no financial or proprietary interest in the materials presented herein. AUTHOR CONTRIBUTIONS Study concept and design (APC, WWC, AG, PKV, SHY); data collection (APC, SHY); analysis and interpretation of data (FC, PC); drafting of the manuscript (APC, FC, PC); critical revision of the manuscript (WWC, AG, PKV, SHY); statistical expertise (AG); supervision (WWC, SHY) Correspondence: Anat Galor, MD, Bascom Palmer Eye Institute, 900 NW 17th Street, Miami, FL 33136. E-mail: agalor@med.miami.edu 10.3928/1081597X-20130617-07Keywords
This publication has 20 references indexed in Scilit:
- Intraocular Lens Power Calculations after Myopic Laser Refractive Surgery: A Comparison of Methods in 173 EyesOphthalmology, 2011
- Intraocular lens power calculation after myopic excimer laser surgery: Clinical comparison of published methodsJournal of Cataract & Refractive Surgery, 2010
- Cataract surgery after refractive surgeryCurrent Opinion in Opthalmology, 2010
- Intraocular lens power adjustment nomogram after laser in situ keratomileusisJournal of Cataract & Refractive Surgery, 2009
- Intraocular lens power calculation after previous laser refractive surgeryJournal of Cataract & Refractive Surgery, 2009
- Corneal Refractive Power Estimation and Intraocular Lens Calculation after Hyperopic LASIKOphthalmology, 2009
- Calculation of intraocular lens power: a reviewActa Ophthalmologica Scandinavica, 2007
- Calculation of intraocular lens power after corneal refractive surgeryClinical & Experimental Ophthalmology, 2006
- Nomogram-Based Intraocular Lens Power Adjustment after Myopic Photorefractive Keratectomy and LASIK: A New ApproachOphthalmology, 2005
- Analysis of intraocular lens power calculation in post-radial keratotomy eyesJournal of Cataract & Refractive Surgery, 2003