Corneal ablation rate at 266 nm

Per Söderberg, Fabrice Manns, Stephen Sulhorn, Nelson Salas, Peggy Lamar, Jean Marie Parel

Research output: Contribution to journalConference article

Abstract

The potential of ns pulses of 266 nm from a frequency shifted NdYag laser for corneal ablation was tested on human eye bank eyes. Scanning electron microscopy demonstrated that consecutive pulses in the same spot induced thermal damage that was related to the pulse energy. The ablation threshold was estimated to 4.5 J/cm2. The ablation per pulse slightly above threshold was 0.2-0.6 μm. It is concluded that the precision of the ablation is relevant for refractive ablations of the cornea. The higher radiant exposure required for corneal ablation at 266 nm compared to that for shorter wavelengths induces higher energy load on the cornea. To avoid heat build-up, a random flying spot is probably needed.

Original languageEnglish (US)
Pages (from-to)77-82
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4951
DOIs
StatePublished - Dec 5 2003
EventPROGRESS IN BIOMEDICAL OPTICS AND IMAGING: Opthalmic Technologies XIII - San Jose, CA, United States
Duration: Jan 25 2003Jan 26 2003

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Keywords

  • 266 nm
  • Ablation rate
  • Cornea

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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