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 language | English (US) |
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Pages (from-to) | 77-82 |
Number of pages | 6 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 4951 |
DOIs | |
State | Published - Dec 5 2003 |
Event | PROGRESS IN BIOMEDICAL OPTICS AND IMAGING: Opthalmic Technologies XIII - San Jose, CA, United States Duration: Jan 25 2003 → Jan 26 2003 |
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