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Open AccessArticle

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

1
Department of Graphical Expression, Technical University of Cartagena, 30202 Cartagena, Spain
2
Group of Optics and Visual Perception, Department of Optics, Pharmacology and Anatomy, University of Alicante, 03690 Alicante, Spain
3
Keratoconus Unit of Vissum Corporation Alicante, 03016 Alicante, Spain
4
Department of Ophthalmology, Miguel Hernández University of Elche, 03202 Alicante, Spain
*
Author to whom correspondence should be addressed.
Symmetry 2018, 10(10), 453; https://doi.org/10.3390/sym10100453
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)
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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