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Changes in wave-front aberrations after rigid gas permeable contact lens fitting in post—laser in situ keratomileusis patients with visual complaints

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      Abstract

      Objective: To evaluate the effect of rigid gas permeable (RGP) contact lenses in reducing wave-front aberrations in post-laser in situ keratomileusis (LASIK) myopic patients.
      Design: Cross-sectional study.
      Participants: Thirty patients with visual complaints after conventional LASIK procedure for correcting myopia.
      Methods: The 30 patients were fitted with RGP contact lenses. Wave-front measurements were taken before and after RGP contact lens wearing.
      Results: Compared with bare eye examinations, root mean-square values of higher-order aberrations (HOAs) significantly decreased with RGP contact lens use. Amongthese, spherical aberration decreased from 0.507 (SD 0.304) μm to 0.164 (SD 0.121) μm(t = 7.186, p < 0.001); coma decreased from 0.470 (SD 0.312) μm to 0.165 (SD 0.090) μm (t = 5.566, p < 0.001); secondary coma decreased from 0.079 (SD 0.050) μm to 0.044 (SD 0.027) μm (t = 4.118, p < 0.001); and total HOAs decreased from 0.782 (SD 0.449) μm to 0.307 (SD 0.140) μm (t = 6.710, p < 0.001).
      Conclusions: Fitting RGP contact lenses effectively decreased HOAs induced by conventional myopic LASIK surgery. Possible reasons may be the elimination of irregularity and dissymmetry on the corneal anteriorsurface, relief of the aspherical extent of the central corneal surface, and enlargement of the effective optical zone.

      Résumé

      Objet: Évaluation de l’effet des verres de contact rigides perméables au gaz (RPG) pour réduire les aberrations du front d’ondes chez les patients myopes à la suite d’une kératomileusis in situ au laser (LASIK).
      Nature: Etude transversale.
      Participants: Trente patients avec plaintes visuelles après une procedure conventionnelle au LASIK pour corriger une myopie.
      Methodes: Les 30 patients ont recu des verres de contact RPG. Les mesures des aberrations du front d’ondes ont été prises avant et après le port des verres de contact RPG.
      Résultats: Comparativement aux examens des yeux sans verres, les valeurs quadratiques racines des aberrations d’ordre supérieur (AOS) ont baissé de façon significative avec l’utilisation de verres de contact RPG. Parmi celles-ci, l’aberration sphérique a diminué de 0,507 (ÉT 0,304) μm à 0,164 (ÉT 0,121) μm (t = 7,186, p < 0,001); le coma a diminué de 0,470 (SD 0,312) μ à 0,165 (ÉT 0,090) μ (t = 5,566, p < 0,001); le coma secondaire a diminué de 0,079 (ÉT 0,050) μ à 0,044 (ÉT 0,027) μ (t < 4,118, p < 0,001); et l’ensemble des AOS a baissé de 0,782 (ÉT 0,449) μ à 0,307 (ÉT 0,140) μ (t < 6,710, p < 0,001).
      Conclusions: L’ajustement des verres de contacts RPG abaisse effectivement les AOS induites par la chirurgie conventionnelle de la myopie au LASIK. Les raisons possibles sont peut-être l’élimination de l’irrégularité et de la dissymétrie de la surface cornéenne antérieure, le soulagement de l’étendue asphérique de la surface cornéenne centrale et l’élargissement de la zone optique effective.

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