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Topographic Paracentral Corneal Thickness With Pentacam and Orbscan: Effect of Acoustic Factor

González-Pérez, Javier O.D., M.Sc., Ph.D.; González-Méijome, Jose M O.D., Ph.D.; Rodríguez Ares, María T M.D., Ph.D.; Parafita, Manuel A M.D., Ph.D.

doi: 10.1097/ICL.0b013e3182323dcf

Purpose: To evaluate the effect of an acoustic factor (AF) on the comparison of central corneal thickness (CCT) and peripheral corneal thickness (PCT) measurements with Orbscan II and Pentacam.

Methods: The CCT and PCT at 1, 2, and 3 radial distances from the corneal apex were measured using Orbscan II and Pentacam in 22 right eyes of 22 healthy adults (7 men, 15 women). Three measures were obtained from each 1 of the 25 points measured and then compared to gauge the agreement between both devices at the corneal center and anular areas located at 1-, 2-, and 3-mm distances from the central measurement. Orbscan II readings were considered with and without an AF correction.

Results: Pentacam provides statistically significant higher values than Orbscan II does at all the 25 locations analyzed (P<0.001). With a few exceptions, the average difference was fairly constant between 20 and 40 μm for all the corneal locations. A high correlation existed between central readings (r 2=0.927; P<0.001) and average thickness at each one of the annular areas being analyzed (r 2=0.897 at 1 mm, r 2=0.876 at 2 mm, and r 2=0.870 at 3 mm); Pentacam minus Orbscan II value averaged for all the points changed from −28±10 to −22±9 μm after the removal of the AF in Orbscan II.

Conclusions: Central and peripheral measurements of the corneal thickness obtained with Orbscan II and Pentacam are significantly different. The removal of the AF in Orbscan II renders lower mean differences but decreases the agreement between both systems and potentially induces an overestimation of CCT and PCT by Orbsan II compared with Pentacam.

From the Ocular Surface and Contact Lens Research Laboratory (J.G.-P., J.M.G.-M., M.A.P.); Department of Applied Physics (Optics) (J.G.-P.), University of Santiago de Compostela, A Coruña, Spain; Clinical and Experimental Optometry Research Laboratory (J.M.G.-M), Center of Physics (Optometry), School of Sciences, University of Minho, Braga, Portugal; and Department of Surgery (Ophthalmology) (M.T.R.A., M.A.P.), University of Santiago de Compostela, A Coruña, Spain.

Supported by national grant PI081380 from Instituto de Salud Carlos III, Spain granted to Ocular Surface and Contact Lens Research Group GI-1750.

The authors have no funding or conflicts of interest to disclose.

Address correspondence and reprint requests to Javier González-Pérez, O.D., M.Sc., Ph.D., Department of Applied Physics (Optometry), School of Optometry, Campus Vida, Universidade de Santiago de Compostela, 15782–A Coruña, Spain; e-mail:

Accepted August 10, 2011.

© 2011 Lippincott Williams & Wilkins, Inc.