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J Refract Surg. 2006 Nov;22(9):S969-72.

The ideal excimer beam for refractive surgery.

Author information

  • 1Alcon Orlando Technology Center, Orlando, FL, USA. george.pettit@alconlabs.com

Abstract

PURPOSE:

To identify essential considerations for the optimal excimer laser beam for refractive laser surgery and further to determine specific beam parameters fulfilling the essential requirements.

METHODS:

Starting with the fundamental laser tissue interaction, the various parameters defining the laser beam are analyzed and optimal values for each are evaluated.

RESULTS:

Gaussian beams generally produce smoother ablated surfaces than "flat top" beams. Optimal ablation efficiency for a Gaussian profile occurs at a peak laser fluence of approximately 450 mJ/cm2. To treat realistic optical aberrations the Gaussian spot size should be < 0.9 mm. The laser repetition rate for such a beam can be multiple hundred hertz without causing thermal damage if a "flying spot" strategy is used. Accurate treatment under such conditions requires both high-fidelity laser spot placement and high-performance eye tracking.

CONCLUSIONS:

Surgical systems using the characteristics defined in this study should yield excellent treatment outcomes.

PMID:
17124899
[PubMed - indexed for MEDLINE]
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