Method of preventing the induction of aberrations in laser...

A - Human Necessities – 61 – B

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A61B 3/107 (2006.01) A61B 18/20 (2006.01) A61F 9/01 (2006.01)

Patent

CA 2569939

The invention relates to a method of preventing the induction of aberrations in laser refractive surgery systems. Standard laser refractive surgery systems successfully correct low-order refractive errors (myopia, hypermetropia and astigmatism), but induce spherical aberration and, by extension, other high- order aberrations, which result in a worsening of vision quality. Said increase in spherical aberration is due to the shape of the cornea, and not inherent in the theoretical ablation profile, and, as a result, the problem is, in principle, common to all laser systems. The invention relates to a systematic method which can be used with any system and ablation profile in order to obtain a profile correction factor. The correction factor, which is specific to each system, can be applied in order to prevent the induction of spherical aberration and, in this way, improve the optical and visual quality of patients following surgery compared to surgery performed with standard systems. Moreover, the inventive method can be used to improve the production of lenses with controlled high-order aberrations which are formed using laser systems.

Les systèmes classiques de chirurgie réfractive au laser corrigent avec succès les erreurs réfractives d'ordre bas (myopie, hypermétropie et astigmatisme) mais ils induisent une aberration sphérique (et par extension d'autres aberrations d'ordre élevé) qui se traduit par une détérioration de l'acuité de vision. Ladite augmentation de l'aberration sphérique est due à la géométrie de la cornée, non inhérente au profil théorique d'ablation, du fait que le problème est, en principe, commun à n'importe quel système laser. La présente invention concerne un procédé systématique, applicable à n'importe quel système et profil d'ablation, permettant l'obtention d'un facteur correcteur de profil. L'application dudit facteur correcteur, spécifique à chaque système, permet d'éviter l'induction d'une aberration sphérique et améliore d'autant l'acuité optique et visuelle des patients après chirurgie, par comparaison avec une chirurgie réalisée à l'aide des systèmes classiques. Ainsi, ce procédé peut s'appliquer à l'amélioration de la production de lentilles ayant des aberrations régulées d'ordre élevé, taillées à l'aide de systèmes laser.

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