Surgery – Instruments – Light application
Patent
1995-04-26
1998-07-14
Shay, David
Surgery
Instruments
Light application
606 3, 606 5, 606 10, 606 13, A61N 506
Patent
active
057796963
ABSTRACT:
A noninvasive method is described for performing accurate and controlled reshaping of the anterior surface of the cornea in order to correct ocular refractive errors such as myopia (nearsightedness), hyperopia (farsightedness), and astigmatism. The invention uses a light source emitting a wavelength or wavelengths with correct optical penetration depth(s) to induce changes in corneal stromal collagen without damaging the corneal endothelium, together with a light delivery and control means for producing the required irradiance, exposure time, and geometric pattern, in order to achieve the desired change in corneal shape. Corneal shape is monitored before, during, and after the procedure by a corneal topography system. Anterior corneal surface cooling by a transparent heat sink is used to prevent damage to the epithelium and to Bowman's layer.
REFERENCES:
patent: 5437658 (1995-08-01), Muller et al.
Schroder et al; "An Ophthalmic Excimer Laser for Corneal Surgery"; Am J. Ophthal. vol. 103, No. 3 Mar. 1987 pp. 472-473.
Taboila et al; "Optically Coupled Technique for Photorefractive Surgery of the Cornea; Optics Letters"; vol 15; No. 9; May 1, 1990; pp. 458-460.
Seiler et al. "Laser Thermokeratoplasty by Means of a Pulsed Holmuim: YAG Laser for Hyperopic Correction" Refractive & Corneal Surg. vol. 6 pp. 338-339 Sep./Oct. 1990.
Valderrama et al "Chemical Laser Interactions with Human Corneal Tissue"; SPIE vol. 1064 Thermal & Optical Interact with Biol & Related Composite Materials (1989) pp. 135-145.
Berry Michael J.
Hennings David R.
Vassiliadis Arthur V.
Shay David
Sunrise Technologies International Inc.
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