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Purpose To compare the preoperative CCT, ACD, and central corneal power measured with the Pentacam HR (Oculus Optikgerte GmbH, Germany) rotating single Scheimpflug camera and the Galilei Dual Scheimpflug Analyzer (Ophthalmic Systems AG, Switzerland) in normal corneas.

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Comparison of Central Corneal Thickness, Anterior Chamber Depth, and Central Corneal Power Measurements between Two Scheimpflug Imaging Systems Yuichi Hori, MD, PhD, and Yuzo Deguchi, MD Department of Ophthalmology Toho University Sakura Medical Center, Sakura, Japan Financial disclosure: The authors have no financial interest in any aspect of this presentation. Background Measurements of corneal thickness and curvature are of paramount importance in corneal refractive surgery. A rotating Scheimpflug analysis system allows acquisition of multiple images of the anterior segment of the eye and calculation of measurements of the central corneal thickness (CCT), corneal curvature, and anterior chamber depth (ACD). Several rotating Scheimpflug analysis systems are available for use in the clinic. Purpose To compare the preoperative CCT, ACD, and central corneal power measured with the Pentacam HR (Oculus Optikgerte GmbH, Germany) rotating single Scheimpflug camera and the Galilei Dual Scheimpflug Analyzer (Ophthalmic Systems AG, Switzerland) in normal corneas. Subjects 43 right eyes of 43 patients (21 women, 22 men) scheduled to undergo cataract surgery at the Department of Ophthalmology, Toho University Sakura Medical Center Mean age: 60.8 16.5 years No corneal abnormalities as verified by slit-lamp examination Mean spherical equivalent: 2.05 diopters (D) Methods Each patient underwent imaging with both rotating Scheimpflug imaging systems, the Pentacam HR and the Galilei The instruments were used in random order. The CCT, ACD, and central corneal power (front and back axial powers) were compared between the two Scheimpflug imaging systems. The data obtained with the two modalities were presented graphically on Bland-Altman plots. Pentacam HRGalilei CCT Mean (-14.11) Mean - 2 SD Mean +2 SD Average CCT (um) CCT Pentacam CCT Galilei (um) Mean SD SD25.72 Bland-Altman plot Pentacam HR (um)Galilei (um) Mean Standard Deviation (SD) * P < 0.001, paired t test Results 1 The mean CCT values measured with the Pentacam HR (mean, 542.433.6 um) was significantly (p

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