Diffractive smoothing of excimer laser ablation using a defocused beam

Ronald R Krueger, Wei Wang Xun Wei Wang, M. Rudisill, S. L. Trokel, P. J. McDonnell

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

OBJECTIVE: To determine if excimer laser myopic ablation with a defocused laser image produces a smoother ablation profile than does focused laser light. METHODS: An ArF excimer laser was used to ablate a 5.00-diopter myopic correction in test blocks using both a contracting and expanding iris aperture. Defocused ablation was performed using a contracting iris aperture by translating the target away from the laser source. A confocal laser scanning microscope was used to analyze the surface smoothness at 55x and 275x magnifications. RESULTS: The confocal laser scanning micrographs revealed a series of sharply demarcated concentric ridges in the focused ablation, and less prominent, slightly wavy lines in the defocused ablation performed with a contracting aperture. The focused ablation with an expanding aperture also created concentric ridges toward the periphery, but with slightly smoother edges. CONCLUSION: Micrographic analysis of the surface profile of excimer laser myopic ablation using a variable iris aperture revealed the presence of concentric ridges following focused ablation and smooth curvilinear lines when ablation was performed with a defocused image.

Original languageEnglish (US)
Pages (from-to)20-26
Number of pages7
JournalRefractive and Corneal Surgery
Volume10
Issue number1
StatePublished - Jan 1 1994

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Excimer Lasers
Laser Therapy
Lasers
Iris
Light

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Krueger, R. R., Xun Wei Wang, W. W., Rudisill, M., Trokel, S. L., & McDonnell, P. J. (1994). Diffractive smoothing of excimer laser ablation using a defocused beam. Refractive and Corneal Surgery, 10(1), 20-26.

Diffractive smoothing of excimer laser ablation using a defocused beam. / Krueger, Ronald R; Xun Wei Wang, Wei Wang; Rudisill, M.; Trokel, S. L.; McDonnell, P. J.

In: Refractive and Corneal Surgery, Vol. 10, No. 1, 01.01.1994, p. 20-26.

Research output: Contribution to journalArticle

Krueger, RR, Xun Wei Wang, WW, Rudisill, M, Trokel, SL & McDonnell, PJ 1994, 'Diffractive smoothing of excimer laser ablation using a defocused beam', Refractive and Corneal Surgery, vol. 10, no. 1, pp. 20-26.
Krueger RR, Xun Wei Wang WW, Rudisill M, Trokel SL, McDonnell PJ. Diffractive smoothing of excimer laser ablation using a defocused beam. Refractive and Corneal Surgery. 1994 Jan 1;10(1):20-26.
Krueger, Ronald R ; Xun Wei Wang, Wei Wang ; Rudisill, M. ; Trokel, S. L. ; McDonnell, P. J. / Diffractive smoothing of excimer laser ablation using a defocused beam. In: Refractive and Corneal Surgery. 1994 ; Vol. 10, No. 1. pp. 20-26.
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