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Symmetry 2018, 10(10), 453;

Assessment of Pattern and Shape Symmetry of Bilateral Normal Corneas by Scheimpflug Technology

Department of Graphical Expression, Technical University of Cartagena, 30202 Cartagena, Spain
Group of Optics and Visual Perception, Department of Optics, Pharmacology and Anatomy, University of Alicante, 03690 Alicante, Spain
Keratoconus Unit of Vissum Corporation Alicante, 03016 Alicante, Spain
Department of Ophthalmology, Miguel Hernández University of Elche, 03202 Alicante, Spain
Author to whom correspondence should be addressed.
Received: 31 July 2018 / Revised: 5 September 2018 / Accepted: 19 September 2018 / Published: 1 October 2018
(This article belongs to the Special Issue Applications Based on Symmetrical Characteristics of the Human Body)
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Purpose: The aim of this study was to assess bilateral symmetry in normal fellow eyes by using optical and geometric morphometric parameters. Methods: All participants underwent complete biocular examinations. Scheimpflug tomography data from 66 eyes of 33 patients were registered. The interocular symmetry was based on five patterns: morphogeometric symmetry, axial symmetry at the corneal vertex, angular-spatial symmetry, direct symmetry (equal octants), and enantiomorphism (mirror octants). Results: No statistically significant differences were found between right and left eyes in corneal morphogeometric (p ≥ 0.488) and aberrometric parameters (p ≥ 0.102). Likewise, no statistically significant differences were found in any of the axial symmetry parameters analyzed (p ≥ 0.229), except in the surface rotation angle beta (p = 0.102) and translation coordinates X0 and Y0 (p < 0.001) for the anterior corneal surface, and the rotation angle gamma (p < 0.001) for the posterior surface. Similarly, no statistically significant differences were identified for direct symmetry (p ≥ 0.20) and enantiomorphism (p ≥ 0.75), except for some elevation data in the posterior surface (p < 0.01). Conclusions: The level of symmetry of both corneas of a healthy individual is high, with only some level of disparity between fellow corneas in rotation and translation references. Abnormalities in this pattern of interocular asymmetry may be useful as a diagnostic tool. View Full-Text
Keywords: healthy cornea; interocular difference; nasal-temporal asymmetry; geometric morphometry; corneal tomography healthy cornea; interocular difference; nasal-temporal asymmetry; geometric morphometry; corneal tomography

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Cavas-Martínez, F.; Piñero, D.P.; Fernández-Pacheco, D.G.; Mira, J.; Cañavate, F.J.F.; Alió, J.L. Assessment of Pattern and Shape Symmetry of Bilateral Normal Corneas by Scheimpflug Technology. Symmetry 2018, 10, 453.

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