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Shack-Hartmann-Based wavefront analyzer for calibrating excimer lasers.

Seema Somani1, Luke Cheng, Leander Zickler

  • 1VISX Incorporated, Santa Clara, CA 95051 , USA. seema.somani@amo-inc.com

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|November 28, 2006
PubMed
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This study introduces a new wavefront-based system for calibrating excimer lasers used in refractive surgery. This objective method significantly improves accuracy over traditional lensometry, enhancing surgical outcomes.

Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Metrology

Background:

  • Current refractive surgery laser calibration relies on manual lensometry, offering limited accuracy (approx. 0.25 D).
  • Objective calibration using wavefront technology promises enhanced precision for improved surgical results.

Purpose of the Study:

  • To describe a Shack-Hartmann wavefront-based instrument for measuring ablated plastic lenses.
  • To enable accurate calibration and quality control of excimer laser systems.

Main Methods:

  • A Shack-Hartmann wavefront sensor was developed with an LED source, lenslet array, and CCD camera.
  • The system analyzes wavefront aberrations in a 5 mm pupil, with measurements validated against calibrated glass lenses and a surface profile scanner.

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Main Results:

  • The instrument demonstrated high repeatability (>0.01 D) and accuracy (>0.04 D) for spherical and cylindrical lenses.
  • Measurements of excimer-ablated plastic lenses showed agreement within 0.10 D with a surface profile scanner.

Conclusions:

  • Wavefront-based calibration offers superior accuracy for excimer laser energy settings, improving refractive correction precision.
  • The automated system reduces operator subjectivity and calibration time.