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Author Notes:

Correspondence: Phoebe D. Lenhart, MD, Emory Eye Center, 1365-B North Clifton Road NE, Atlanta, Georgia 30322; Email: phoebe.lenhart@emory.edu.

Disclosures: No author has a financial or proprietary interest in any material or method mentioned.


Research Funding:

Supported by National Institutes of Health (NIH) grants U10 EY13272 and U10 EY013287 and in part by NIH Departmental Core Grant EY06360, Bethesda, Maryland, and Research to Prevent Blindness, Inc., New York, New York, USA.

Partial coherence interferometry versus immersion ultrasonography for axial length measurement in children


Journal Title:

Journal of Cataract and Refractive Surgery


Volume 36, Number 12


, Pages 2100-2104

Type of Work:

Article | Post-print: After Peer Review


Purpose: To determine whether measurements obtained by partial coherence interferometry (PCI) correlate well with measurements obtained using immersion ultrasound (US) in children. Setting: Department of Ophthalmology, Emory University School of Medicine, Atlanta, Georgia, USA. Design: Evaluation of a diagnostic test or technology. Methods: The charts of pediatric patients who had cataract surgery from August 2008 to September 2009 were reviewed. Axial length (AL) measurements in the operative eye were obtained using PCI at the preoperative clinic visit and then using immersion US in the operating room before surgery. The data were compared to determine the degree of agreement. Results: The charts of 18 patients (27 eyes) were reviewed. Preoperative AL measurements by PCI were obtained in 21 eyes (78%). On average, the PCI-measured ALs were 0.1 mm less than the immersion US values (95% confidence interval, −0.2 to −0.1; P = .002). All eyes with an AL of 23.5 mm or less had lower PCI values than immersion US values. There was no systematic pattern of 1 measurement being greater or less than the other in eyes with an AL longer than 23.5 mm. Conclusions: There is a systematic difference in AL measurement between PCI and immersion US, with PCI tending to give lower values, particularly in eyes with an AL longer than 23.5 mm. Depending on the length of the eye, a 0.1 mm error in AL measurement could result in a 0.25 to 0.75 diopter difference in intraocular lens calculation that could be clinically significant in some patients.

Copyright information:

© 2010 American Society of Cataract and Refractive Surgery and European Society of Cataract and Refractive Surgeons. Published by Elsevier Inc. All rights reserved.

This is an Open Access work distributed under the terms of the Creative Commons Attribution-NonCommerical-NoDerivs 3.0 Unported License (http://creativecommons.org/licenses/by-nc-nd/3.0/).

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