Corneal Surface Morphology Following Excimer Laser Ablation with Humidified Gases

Ronald R. Krueger, Mauro Campos, Xun Wei Wang, Martha Lee, Peter J. McDonnell

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


To compare the effects of blowing dry (nitrogen or helium) and humidified gases over the corneal surface during photorefractive keratectomy. Excimer laser myopic ablations were performed on porcine eyes (10 per group) using humidified and dry nitrogen and helium gas under ambient conditions. Surface smoothness was quantified with light and electron microscopy. Corneas that were ablated using humidified gas were smooth and equivalent to those ablated under ambient conditions. Dry nitrogen and helium blowing resulted in increased surface irregularity evident on light and electron microscopy (P<.001). The pseudomembranes in the humidified gas and ambient air groups had fewer surface discontinuities than did those in the nonhumidified gas groups and appeared to have a thinner electron-dense surface layer. The blowing of humidified gas during excimer laser corneal ablation produces a smoother surface than does the blowing of dry gas and is comparable to that produced under ambient (no blowing) conditions. Maintaining corneal moisture is important in photorefractive keratectomy. If blowing gas is necessary to remove debris from the surface, the gas should be humidified.

Original languageEnglish (US)
Pages (from-to)1131-1137
Number of pages7
JournalArchives of Ophthalmology
Issue number8
StatePublished - Aug 1993
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology


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