Ms. Radha Pertaub Profile

Radha Pertaub

Sales Representative at Glaukos Corp

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Proceedings Article | 24 February 2009 Paper

Experimental results of a new system using microwaves for vision correction

Thomas Ryan, Radha Pertaub, Steven Meyers, Russell Dresher, Ronald Scharf

Proceedings Volume 7181, 718106 (2009) https://doi.org/10.1117/12.811158

KEYWORDS: Cornea, Eye, Electrodes, Collagen, Microwave radiation, Scanning electron microscopy, Tissues, Laser vision correction, Wavefronts, Spherical lenses

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Technology is in development to correct vision without the use of lasers or cutting of the eye. Many current technologies used to reshape the cornea are invasive, in that either RF needles are placed into the cornea or a flap is cut and then a laser used to ablate the cornea in the optical zone. Keraflex, a therapeutic microwave treatment, is a noninvasive, non-incisional refractive surgery procedure capable of treating myopia (nearsightedness). The goal is to create a predictable refractive change in the optical zone, while preserving the epithelium and deeper structures of the eye. A further goal is to avoid incisions and damage to the epithelium which both require a post-treatment healing period. Experimental work with fresh porcine eyes examined the following variables: duration of the RF pulse, RF power level, coolant amount and timing, electrode spacing, applanation force against the eye, initial eye temperature, and age of eye. We measured curvature changes of the eye with topography, Scheimpflug, Wavefront aberrometry or other means to characterize diopter change as an important endpoint. Other assessment includes evaluation of a fine white ring seen in the cornea following treatment. Dose studies have been done to correlate the treated region with energy delivered. The timing and dosing of energy and cooling were investigated to achieve the target diopter change in vision.

Proceedings Article | 12 February 2009 Paper

Numerical model and analysis of an energy-based system using microwaves for vision correction

Radha Pertaub, Thomas Ryan

Proceedings Volume 7181, 718105 (2009) https://doi.org/10.1117/12.811154

KEYWORDS: Electrodes, Cornea, Eye, Microwave radiation, Eye models, Dielectrics, Collagen, Tissues, Visual process modeling, Thermal modeling

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A treatment system was developed utilizing a microwave-based procedure capable of treating myopia and offering a less invasive alternative to laser vision correction without cutting the eye. Microwave thermal treatment elevates the temperature of the paracentral stroma of the cornea to create a predictable refractive change while preserving the epithelium and deeper structures of the eye. A pattern of shrinkage outside of the optical zone may be sufficient to flatten the central cornea. A numerical model was set up to investigate both the electromagnetic field and the resultant transient temperature distribution. A finite element model of the eye was created and the axisymmetric distribution of temperature calculated to characterize the combination of controlled power deposition combined with surface cooling to spare the epithelium, yet shrink the cornea, in a circularly symmetric fashion. The model variables included microwave power levels and pulse width, cooling timing, dielectric material and thickness, and electrode configuration and gap. Results showed that power is totally contained within the cornea and no significant temperature rise was found outside the anterior cornea, due to the near-field design of the applicator and limited thermal conduction with the short on-time. Target isothermal regions were plotted as a result of common energy parameters along with a variety of electrode shapes and sizes, which were compared. Dose plots showed the relationship between energy and target isothermic regions.

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