Myopia correction enhancing biodynamic ablation

A - Human Necessities – 61 – F

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A61F 9/01 (2006.01)

Patent

CA 2490652

This invention is directed to a method for providing a LASIK or a LASEK myopia vision correction, and to a medium that has stored therein an instruction for directing a laser vision correcting laser platform to deliver a controlled biodynamic ablation according to the invention. A known biodynamic response of the eye is induced by performing a controlled laser ablation in a cornea of the eye outside of an optical zone for the nominal ablation in a laser vision correction surgery. An ablation ring, or portion thereof, outside of the optical zone produces a biodynamic flattening of the central region of the cornea which in turn provides for a decreased depth of volumetric ablation to correct a myopic refractive defect of the eye. Such controlled biodynamic flattening may provide the opportunity for laser vision correction in patients whose corneas would otherwise be too thin post-operatively to warrant laser vision correction.

L'invention concerne un procédé permettant de corriger la myopie par voie LASIK ou LASEK, ainsi qu'un support ayant mémorisé une instruction pour piloter la plate-forme laser de correction de la vision par laser, afin de pratiquer une ablation biodynamique régulée selon l'invention. Une réponse biodynamique de l'oeil est induite par ablation laser régulée, dans la cornée d'un oeil en dehors d'une zone optique pour l'ablation nominale en chirurgie de correction de la vision par laser. Une bague d'ablation ou une partie de cette bague, en dehors de la zone optique, produit un aplatissement biodynamique de la zone centrale de la cornée, induisant à son tour une profondeur amoindrie d'ablation volumétrique, afin de corriger une défectuosité réfractive myopique de oeil. Un aplatissement biodynamique régulé de ce type peut permettre d'utiliser la correction de la vision par laser chez des patients dont les cornées auraient sinon été trop minces, après intervention chirurgicale, pour garantir une correction de la vision par laser.

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