Scleral topography analysed by optical coherence tomography


Purpose: A detailed evaluation of the corneo-scleral-profile (CSP) is of particular relevance in soft and scleral lenses fitting. The aim of this study was to use optical coherence tomography (OCT) to analyse the profile of the limbal sclera and to evaluate the relationship between central corneal radii, corneal eccentricity and scleral radii. Methods: Using OCT (Optos OCT/SLO; Dunfermline, Scotland, UK) the limbal scleral radii (SR) of 30 subjects (11. M, 19F; mean age 23.8. ±. 2.0SD years) were measured in eight meridians 45° apart. Central corneal radii (CR) and corneal eccentricity (CE) were evaluated using the Oculus Keratograph 4 (Oculus, Wetzlar, Germany). Differences between SR in the meridians and the associations between SR and corneal topography were assessed. Results: Median SR measured along 45° (58.0; interquartile range, 46.8-84.8. mm) was significantly (p. <. 0.001) flatter than along 0° (30.7; 24.5-44.3. mm), 135° (28.4; 24.9-30.9. mm), 180° (23.40; 21.3-25.4. mm), 225° (25.8; 22.4-32.4. mm), 270° (28.8; 25.3-33.1. mm), 315° (30.0; 25.0-36.9. mm), and 90° (37.1; 29.1-43.4. mm). In addition, the nasal SR along 0° were significant flatter than the temporal SR along 180° (p. <. 0.001). Central corneal radius in the flat meridian (7.83. ±. 0.26. mm) and in the steep meridian (7.65. ±. 0.26. mm) did not correlate with SR (p = 0.186 to 0.998). There was no statistically significant correlation between corneal eccentricity and scleral radii in each meridian (p = 0.422). Conclusions: With the OCT device used in this study it was possible to measure scleral radii in eight different meridians. Scleral radii are independent of corneal topography and may provide additional data useful in fitting soft and scleral contact lenses.

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Divisions: College of Health & Life Sciences > School of Optometry > Optometry & Vision Science Research Group (OVSRG)
College of Health & Life Sciences > School of Optometry > Optometry
College of Health & Life Sciences
College of Health & Life Sciences > School of Optometry > Vision, Hearing and Language
Additional Information: © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Uncontrolled Keywords: cornea radius,corneal eccentricity,corneo-scleral topography,optical coherence tomography,scleral radius,Ophthalmology,Optometry
Publication ISSN: 1476-5411
Last Modified: 08 Jul 2024 07:31
Date Deposited: 25 May 2017 09:20
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.sci ... 1400?via%3Dihub (Publisher URL)
PURE Output Type: Article
Published Date: 2017-08-01
Published Online Date: 2017-05-08
Accepted Date: 2017-04-28
Submitted Date: 2016-11-02
Authors: Bandlitz, Stefan
Bäumer, Joachim
Conrad, Uwe
Wolffsohn, James (ORCID Profile 0000-0003-4673-8927)

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