Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | S567 |
| Fachzeitschrift | Investigative Ophthalmology and Visual Science |
| Jahrgang | 37 |
| Ausgabenummer | 3 |
| Publikationsstatus | Veröffentlicht - 15 Feb. 1996 |
Abstract
Purpose. Correction of myopia with the ArF-excimer laser (PRK) sometimes leads to a so called 'Central Island' formation on the anterior corneal surface. The attenuation of the laser beam by the ablation plume might be one reason for this phenomenon. Methods. The attenuation properties of the ablation plume were investigated by a probe beam parallel to the surface of the tissue probe. By variing the laser parameters (fluence, repetition rate, spot size) and the target tissue (cornea, PMMA) the attenuation of the probe beam was measured time and spatial resolved. Furthermore, the ablation efficiancy was measured as a function of the repetition rate and an external air flow. Results. The ablation plume consitsts of a fast and a slow component. The interaction of the laser pulse with fast component is negligible. The slow component lasts for several seconds over the ablated area and interacts with the following laser pulses. An air flow significiantly increases the ablation rate. Conclusion. The induction of a Central Island Formation on PRK due to plume absorption is possible. An air flow on the tissue target during the calibration procedure or during patient treatment will influence the refractive outcome of the patients eye due to the significiant dependence of the ablation efficiancy on the air flow.
ASJC Scopus Sachgebiete
- Medizin (insg.)
- Ophthalmologie
- Neurowissenschaften (insg.)
- Sensorische Systeme
- Neurowissenschaften (insg.)
- Zelluläre und Molekulare Neurowissenschaften
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in: Investigative Ophthalmology and Visual Science, Jahrgang 37, Nr. 3, 15.02.1996, S. S567.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Characterisation of the removal process on ArF-excimer laser photoablation influenced by the ablation plume
AU - Kermani, O.
AU - Lubatschowski, H.
AU - Dörbecker, Ch
AU - Ertmer, W.
PY - 1996/2/15
Y1 - 1996/2/15
N2 - Purpose. Correction of myopia with the ArF-excimer laser (PRK) sometimes leads to a so called 'Central Island' formation on the anterior corneal surface. The attenuation of the laser beam by the ablation plume might be one reason for this phenomenon. Methods. The attenuation properties of the ablation plume were investigated by a probe beam parallel to the surface of the tissue probe. By variing the laser parameters (fluence, repetition rate, spot size) and the target tissue (cornea, PMMA) the attenuation of the probe beam was measured time and spatial resolved. Furthermore, the ablation efficiancy was measured as a function of the repetition rate and an external air flow. Results. The ablation plume consitsts of a fast and a slow component. The interaction of the laser pulse with fast component is negligible. The slow component lasts for several seconds over the ablated area and interacts with the following laser pulses. An air flow significiantly increases the ablation rate. Conclusion. The induction of a Central Island Formation on PRK due to plume absorption is possible. An air flow on the tissue target during the calibration procedure or during patient treatment will influence the refractive outcome of the patients eye due to the significiant dependence of the ablation efficiancy on the air flow.
AB - Purpose. Correction of myopia with the ArF-excimer laser (PRK) sometimes leads to a so called 'Central Island' formation on the anterior corneal surface. The attenuation of the laser beam by the ablation plume might be one reason for this phenomenon. Methods. The attenuation properties of the ablation plume were investigated by a probe beam parallel to the surface of the tissue probe. By variing the laser parameters (fluence, repetition rate, spot size) and the target tissue (cornea, PMMA) the attenuation of the probe beam was measured time and spatial resolved. Furthermore, the ablation efficiancy was measured as a function of the repetition rate and an external air flow. Results. The ablation plume consitsts of a fast and a slow component. The interaction of the laser pulse with fast component is negligible. The slow component lasts for several seconds over the ablated area and interacts with the following laser pulses. An air flow significiantly increases the ablation rate. Conclusion. The induction of a Central Island Formation on PRK due to plume absorption is possible. An air flow on the tissue target during the calibration procedure or during patient treatment will influence the refractive outcome of the patients eye due to the significiant dependence of the ablation efficiancy on the air flow.
UR - http://www.scopus.com/inward/record.url?scp=33750193278&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:33750193278
VL - 37
SP - S567
JO - Investigative Ophthalmology and Visual Science
JF - Investigative Ophthalmology and Visual Science
SN - 0146-0404
IS - 3
ER -