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Proceedings Paper

Increasing corneal curvature by rf current: numerical model studies of governing physical processes
Author(s): John A. Pearce; Chris Ikei
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Paper Abstract

The cornea may be reshaped to correct hyperopia by selective shrinkage of collagen in the stroma using radio Frequency (RF) current from a needle electrode. Continuous sine wave current at constant power has proven very effective to achieve repeatable results by thermally shrinking corneal collagen. Post-treatment relaxation of the collagen may be moderated by creating a larger zone of lesser damage over a longer heating time; rather than using a smaller zone of greater damage created in a shorter time. Finite difference numerical models of the electric fields and resulting thermal events were used to study the process parameters and to identify advantageous treatment strategies. The models include temperature- and water-dependent electrical and thermal properties.

Paper Details

Date Published: 9 February 2007
PDF: 12 pages
Proc. SPIE 6440, Thermal Treatment of Tissue: Energy Delivery and Assessment IV, 64400L (9 February 2007); doi: 10.1117/12.702874
Show Author Affiliations
John A. Pearce, The Univ. of Texas at Austin (United States)
Chris Ikei, Refractec, Inc. (United States)


Published in SPIE Proceedings Vol. 6440:
Thermal Treatment of Tissue: Energy Delivery and Assessment IV
Thomas P. Ryan, Editor(s)

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