Intrastromale refraktive Chirurgie mit ultrakurzen Laserpulsen
Michael Hammera b, Dietrich Schweitzerb c, W. Zieglerd e, M. Wiechmannf g, J. Strobelb c
- aAugenklinik der FSU Jena, Germany. martin.hammer@med.uni-jena.de
- bAugenklinik der FSU Jena, DE
- cAugenklinik der FSU Jena, , , , , , DE
- dInstitut für Optik und Quantenelektronik der FSU Jena, Jena, , , , , , DE
- eInstitut für Optik und Quantenelektronik der FSU Jena, Jena, , DE
- fCarl-Zeiss-Jena GmbH, Jena, , , , , , DE
- gCarl Zeiss Jena, GmbH (Jena, DE)
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Abstract
Purpose: To investigate the possibilities and techniques for intrastromal ablation of the cornea by the use of ultra-short laser pulses. Method: A laser-induced plasma with a diameter of 8 mu was generated 100-300 mu below Bowmans membrane by focussing of a Ti:Saphir laser (lambda=805 nm, pulse width: 115 fs, energy: 0.6-3.3 microJ). Scanning the laser beam enabled arbitrary transsections in the corneal stroma. All experiments were performed in porcine eyes 1-4 h post-mortem. Results: Two-dimensional sections were achieved applying a minimal laser energy of 0.6 microJ at a separation of the single laser effects of 10 micrometer. A 150 micrometer thick disc was excised 150 micrometer below Bowmans membrane and extracted through a keratotomy performed by the laser. Sharp-cut edges were observed by slit-lamp biomicroscopy. Conclusions: Ultra-short laser pulses are suitable for precise intrastromal ablation.