Article Text

other Versions

PDF
Surgically Induced Astigmatism after Posterior Chamber Phakic Intraocular Lens Implantation
  1. Kazutaka Kamiya1,
  2. Kimiya Shimizu1,
  3. Daisuke Aizawa1,
  4. Akihito Igarashi1,
  5. Mari Komatsu2
  1. 1 University of Kitasato School of Medicine, Japan;
  2. 2 Department of Ophthalmology, Sanno Hospital, Japan
  1. * Corresponding author; email: kamiyak-tky{at}umin.ac.jp

Abstract

Aim: To assess astigmatism induced after phakic intraocular lens (Visian ICLTM, STAAR Surgical) implantation.

Methods: We retrospectively examined seventy-three eyes of 47 patients undergoing ICL implantation through a horizontal 3.0-mm clear corneal incision. We quantitatively investigated the amount of corneal astigmatism before and 3 months after surgery using an automated keratometer (ARK-700A, Nidek) and corneal topography (ATRAS995TM, Carl Zeiss Meditec). The surgically induced astigmatism was assessed by vector analysis using the Holladay-Cravy-Koch formula.

Results: The corneal astigmatism was significantly increased from 1.10 ± 0.51 diopters (D) to 1.44 ± 0.57 D using the keratometer (Wilcoxon signed-rank test, p<0.001). It was also significantly increased from 1.16 ± 0.53 D to 1.45 ± 0.57 D using corneal topography (p<0.001). On the other hand, the manifest astigmatism was significantly decreased from 0.93 ± 0.60 D to 0.72 ± 0.58 D (p<0.001). The surgically induced astigmatism was 0.45 ± 0.26 D at an axis of 93.3° using the keratometer and 0.49 ± 0.26 D at an axis of 98.0° using corneal topography.

Conclusions: ICL implantation induces corneal astigmatism through a with-the-rule astigmatic shift of approximately 0.5 D, which was small but not negligible for candidates for refractive surgery.

Statistics from Altmetric.com

Footnotes

    Request permissions

    If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.

    Linked Articles

    • At a glance
      Harminder S Dua Arun D Singh