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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
International values of corneal elevation in normal subjects by rotating Scheimpflug camera
Journal of Cataract and Refractive Surgery, Volume 37, No. 10, Year 2011
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Description
Purpose: To examine whether clinically significant differences exist in corneal elevation data from a sampling of countries worldwide. Setting: International multicenter. Design: Evaluation of diagnostic test or technology. Methods: One randomly selected eye of normal adults from 8 countries spanning 6 continents was examined using the Pentacam Eye Scanner. Anterior and posterior elevations were measured at the apex and thinnest point. Differences between countries were assessed by Kruskal-Wallis. Normative thresholds were defined according to the Tukey method. Results: The study examined 1 eye of 555 patients. Median elevations were similar across countries. Upper limits of normal for collective international data were 3.5 μm, 6.0 μm, 7.5 μm, and 13.5 μm at the anterior apex, anterior thinnest point, posterior apex, and posterior thinnest point, respectively. These and country-specific thresholds were similar to normal values from previous data; however, country-specific thresholds flagged additional eyes in China, Egypt, and India. Those thresholds were 4.5 μm at the anterior thinnest point (China and Egypt), 7.4 μm at the posterior apex (India), and 11.0 μm and 12.0 μm at the posterior thinnest point (China and Egypt, respectively). Conclusions: In general, international variations were clinically insignificant; thus, current screening guidelines maintained their applicability. Notable exceptions were China, Egypt, and India, where country-specific thresholds may better reflect the test populations and minimize potential false negative results from screening. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned. Additional disclosures are found in the footnotes. © 2011 ASCRS and ESCRS.
Authors & Co-Authors
Feng, Matthew T.
United States, Tucson
The University of Arizona
Belin, Michael W.
United States, Tucson
The University of Arizona
Júnior, Renato Ambrósio
Brazil, Rio de Janeiro
Instituto de Olhos Renato Ambrósio
Grewal, Satinder P.S.
India, Chandigarh
Grewal Eye Institute
Yan, Wang
China, Tianjin
Tianjin Medical University
Shafik Shaheen, Mohamed Shafik
Egypt, Alexandria
Faculty of Medicine
Jordon, Charlotte A.
New Zealand, Auckland
The University of Auckland
McGhee, Charles
New Zealand, Auckland
The University of Auckland
Maeda, Naoyuki
Japan, Suita
Graduate School of Medicine
Neuhann, Tobias H.
Germany, Munich
Diabetes Center am Marienplatz Munich
Dick, Hans Burkhard
Germany, Bochum
Universitätsklinikum Der Ruhr-universität Bochum
Steinmueller, Andreas
Germany, Wetzlar
Oculus Optikgeraete Gmbh
Statistics
Citations: 35
Authors: 12
Affiliations: 10
Identifiers
Doi:
10.1016/j.jcrs.2011.04.030
e-ISSN:
18734502
Research Areas
Health System And Policy
Study Locations
Egypt