Electromagnetic Modelling Of A Human Eye
Exposed To Conductive Keratoplasty
Author(s)
A. Peratta
Abstract
This paper presents 3D numerical solutions of the current density, absorbed energy
and initial impedance of the human eye exposed to conductive keratoplasty (CK)
scenarios obtained with the boundary element method. CK is a non-ablative surgical
technique for the treatment of mild to moderate hyperopia (far-sightedness).
In a CK session a thin electrode penetrates the cornea delivering pulsed radiofrequency
energy at 350 kHz to the surrounding tissue. The electromagnetic (EM)
energy is dissipated into heat in the tissue surrounding the tip yielding thermally
localised shrinkage and tightening of the collagen llamelae. When applied in a controlled
way, this relatively new technique allows eye surgeons to correct the shape
of the cornea and to treat common types of eye disease such as far-sightedness
or astigmatism. This work examines in detail the induced currents that appear in
the rest of the eye while delivering the EM signal. Quantitative estimations of the
EM energy absorbed in each tissue per unitary voltage apart from the cornea is
presented, as well as the impedance of the electrodes at initial time.
Keywords: human eye, conductive keratoplasty, boundary element method, electric
field.
1 Introduction
There is a great deal of interest in understanding the electrical properties of the
human eye in the low frequency (LF) range, and how it behaves as a complex
imperfect conductive body. Studies consider the eye as either a passive element
exposed to an external field, or as an active one which produces a complicated pattern
of electrical signals in response to light. The former is usually tackled in order
to understand the vulnerability of the different tissues when exposed to potentially
harmful levels of electric fields at different frequencies, orders of magnitude and
Keywords
human eye, conductive keratoplasty, boundary element method, electric
field.
Related Book
Other papers in this volume
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