Corneal ablation rate at 266 nm

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

doi:10.1117/12.482465

Corneal ablation rate at 266 nm

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

Research output: Contribution to journal › Conference 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 language	English (US)
Pages (from-to)	77-82
Number of pages	6
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	4951
DOIs	https://doi.org/10.1117/12.482465
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

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title = "Corneal ablation rate at 266 nm",

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.",

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AU - Söderberg, Per

AU - Manns, Fabrice

AU - Sulhorn, Stephen

AU - Salas, Nelson

AU - Lamar, Peggy

AU - Parel, Jean Marie

PY - 2003/12/5

Y1 - 2003/12/5

N2 - 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.

AB - 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.

KW - 266 nm

KW - Ablation rate

KW - Cornea

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