Assessment of pattern and shape symmetry of bilateral normal corneas by scheimpflug technology

Journal ar
  • Volumen: 10
  • Número: 10
  • Fecha: 01 enero 2018
  • ISSN: 20738994
  • Tipo de fuente: Revista
  • DOI: 10.3390/sym10100453
  • Tipo de documento: Artículo
  • Editorial: MDPI AG Postfach Basel CH-4005
© 2018 by the authors. 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.

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