Evaluation of Interocular Symmetry from Corneal Elevation Maps in Non-pathological Cases

Recently, several studies related to body symmetry have been carried out, which have served, among other aspects, for the detection and diagnosis of diseases. In the field of ophthalmology, and in reference to the ocular structure, there are several studies that have shown that the presence of interocular symmetry is fundamental in the field of vision for stereopsis, utrocular discrimination or allelotropia. In this study, a morphological characterization of the cornea was made from a personalized geometric modelling of its corneal structure. For this purpose, patient-specific raw data of non-pathological corneas obtained from an artificial vision algorithm of a Scheimpflug tomographer were used. These data were treated radially in space, obtaining maximum and minimum elevation data that were classified by octants with respect to the central and peripheral corneal regions. The results obtained allow to identify the maximum and minimum average heights by corneal radius and to classify these by octants that are defined on the anterior versus posterior corneal surfaces. The areas of predominance of maxima and minima of corneal-radial elevation of the anterior and posterior cornea, and the average height values obtained allow us to obtain an order of magnitude of interocular symmetry in nonpathological eyes. These results demonstrate the existence of mirror symmetry from the point of view of spatial coordinates based on elevation maps.