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Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
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Published on: September 20, 2024

Corneal first surface wavefront aberrations before and after pterygium surgery.

Konrad Pesudovs1, Francisco C Figueiredo

  • 1NH&MRC Centre for Clinical Eye Research, Dept of Ophthalmology, Flinders Medical Centre, Bedford Park, South Australia, 5042, Australia. Konrad.Pesudovs@flinders.edu.au

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|November 28, 2006
PubMed
Summary

Pterygium surgery significantly reduces corneal higher order aberrations, particularly trefoil. Early pterygium excision is recommended to minimize the risk of lasting visual disturbances.

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Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Wavefront Aberrometry

Background:

  • Pterygia are wing-shaped growths on the cornea.
  • They can induce higher order aberrations (HOAs) affecting visual quality.
  • Understanding these aberrations is crucial for surgical planning and outcomes.

Purpose of the Study:

  • To quantify higher order aberrations on the corneal first surface before and after pterygium excision surgery.
  • To assess the impact of pterygium size on postoperative aberrations.

Main Methods:

  • Corneal topography was performed on 67 eyes before and 6 months after pterygium excision.
  • Wavefront aberrations were calculated using a 10th order Zernike polynomial expansion for a 5.0-mm pupil.
  • Statistical analyses determined the significance of pre- to postoperative changes and the relative risk of aberrations by pterygium size.

Main Results:

  • Preoperatively, total higher order RMS wavefront aberration was 0.94 +/- 0.83 microm, with trefoil being the major contributor.
  • Pterygium excision significantly reduced HOAs across all modes (postoperative total higher order RMS: 0.45 +/- 0.35 microm).
  • Larger pterygia were associated with a significantly higher risk of visually significant postoperative aberrations.

Conclusions:

  • Zernike polynomial analysis effectively describes wavefront aberrations in pterygium patients.
  • Pterygia are linked to significant wavefront aberrations, primarily trefoil, which are largely resolved by surgical removal.
  • Timely pterygium excision can prevent or reduce the severity of residual aberrations.