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Related Experiment Videos

Wavefront-guided multipoint (segmental) custom ablation enhancement using the Nidek NAVEX platform.

Howard V Gimbel1, Sandra J Sofinski, Oron S Mahler

  • 1Gimbel Eye Centre, Calgary, Alberta, Canada. hvgimbel@gimbel.com

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|April 18, 2003
PubMed
Summary

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Wavefront-guided enhancement surgery improved vision in patients with prior refractive surgery. This custom ablation technique was safe and effective, resolving visual disturbances without compromising best-corrected visual acuity.

Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Visual Optics

Background:

  • Previous non-wavefront-guided refractive surgery (LASIK/PRK) can lead to reduced visual quality.
  • Higher-order aberrations (HOA) are often implicated in these postoperative visual disturbances.

Observation:

  • This study analyzed 20 eyes (19 patients) experiencing vision reduction after primary refractive surgery.
  • Patients had mixed myopic or hyperopic astigmatism and elevated HOA values.

Findings:

  • Wavefront-guided multipoint (segmental) custom ablation enhancement improved or resolved visual symptoms in all treated eyes.
  • Postoperative HOA values varied and did not always correlate directly with visual function improvement.
  • No patient experienced a loss of two or more lines of best spectacle-corrected visual acuity.

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Implications:

  • Custom ablation enhancement using the Nidek NAVEX platform is a safe and effective retreatment option for refractive surgery.
  • Visual improvements may result from neutralizing chromatic aberrations, enhancing the modulation transfer function, even without significant HOA reduction.