ArticleComparison of anterior and posterior elevation map measurements between 2 Scheimpflug imaging systemsSalouti, Ramin MD∗; Nowroozzadeh, Mohammad H. MD; Zamani, Mohammed MD; Fard, Alireza Hafrkonandeh; Niknam, Sasan MD Author Information From the Department of Ophthalmology, Shiraz University of Medical Sciences, Shiraz, Iran ∗Corresponding author: Ramin Salouti, MD, Department of Ophthalmology, Poostchi Ophthalmology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran. E-mail: [email protected] Submitted: May 23, 2008. Final revision submitted: December 6, 2008. Accepted: January 12, 2009. No author has a financial or proprietary interest in any material or method mentioned. SymbolFirst author:Symbol: No Caption available.Ramin Salouti, MD Department of Ophthalmology, Shiraz University of Medical Sciences, Shiraz, Iran Journal of Cataract & Refractive Surgery: May 2009 - Volume 35 - Issue 5 - p 856-862 doi: 10.1016/j.jcrs.2009.01.008 Buy Metrics Abstract PURPOSE: To compare the anterior and posterior elevation measurements above the best-fit sphere (BFS) between the Galilei (dual-Scheimpflug) and Pentacam (single-Scheimpflug) systems in candidates for refractive surgery. SETTING: Poostchi Ophthalmology Research Center, Shiraz, Iran. METHODS: In this prospective study, both eyes of consecutive patients were examined with the 2 imaging systems. The anterior and posterior BFS and the central and maximum elevation measurements in each of 4 quadrants were compared between the dual-Scheimpflug system and the single-Scheimpflug system. Bland-Altman plots were used to evaluate the agreement in the measurements between the imaging systems. RESULTS: The study comprised 31 patients (62 eyes). The mean radius of the anterior BFS measurement was 7.72 mm ± 0.21 (SD) with the dual-Scheimpflug system and 7.83 ± 0.21 mm with the single-Scheimpflug system. The mean radius of the posterior BFS was 6.37 ± 0.18 mm and 6.47 ± 0.19 mm, respectively. On the anterior and posterior elevation maps, the single-Scheimpflug system led to statistically significantly higher measurements than the dual-Scheimpflug system in the central, inferior, and temporal elevations (P<.001). Bland-Altman plots showed more agreement between the systems in anterior elevation measurements than in posterior elevation measurements. CONCLUSION: In refractive surgery candidates with healthy eyes, the elevation map measurements with the single-Scheimpflug system were significantly different from those with the dual-Scheimpflug system in most aspects and therefore may lead to misinterpretation of clinical data that could alter clinical decisions if the 2 imaging systems are considered interchangeable. © 2009 by Lippincott Williams & Wilkins, Inc.
