MATHEMATICAL MODELING OF APPLANATION AND IMPRESSION TONOMETRY AFTER SURGICAL CORRECTION OF VISIONстатья
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Дата последнего поиска статьи во внешних источниках: 28 февраля 2020 г.
Аннотация:Mathematical modeling of applanation and impression tonometry (by Maklakoff and Schiøtz, respectively) for the eye with artificially induced strong inhomogeneity of the elastic properties of the cornea is performed. Such inhomogeneity arises, in particular, as a result of surgical correction of vision. Corneal weakening is considered either in the apex area (correction of myopia) or in the peripheral annular zone lying close to the sclera (correction of hyperopia). A two-component model of the eyeball is used, in which the cornea is represented by a momentless deformable, linearly elastic surface and the scleral area by an elastic element that responds by changing its volume to changes in intraocular pressure. Within this representation, the mechanical properties of the cornea are characterized by effective stiffness – a parameter that contains both the elastic properties of the cornea material and the cornea thickness. The analysis of the applicability of the relations used in the standard processing of tonometry data, as well as of the simulation results we obtained earlier for the case of a homogeneous cornea, to the operated eyes with significant inhomogeneity of the elastic properties of the cornea is carried out. The corrections caused by heterogeneity turned out to be most significant for the Schiøtz tonometer with apical weakening and fairly high intraocular pressure. In the case of Maklakoff tonometry, the effect of inhomogeneity on the calculation of the true pressure is not too significant for both studied types of cornea weakening.