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Impressum
Intrastromal refractive surgery with ultra-short laser pulses - first invitro experiments
1Hammer M., 1Schweitzer D., 2Ziegler W., 3Wiechmann M., 1Strobel J.
1Augenklinik der FSU Jena, 2Institut für Optik und Quantenelektronik der FSU Jena, 3Carl-Zeiss-Jena GmbH
Goal: To investigate the opportunity and techniques using ultra-short
laser pulses for the intra-stromal ablation of the cornea.
Method: A laser-induced plasma was generated 100 to 300 microns
below Bowmans membrane in the focus of a Ti:Saphir lasers (l=805 nm, pulsewidth:
115 fs, energy: ca. 3.3 µJ). Arbitrary transections were possible
in the corneal stroma scanning the laser. All Experiments were performed
in porcine eyes one to four hours post mortem.
Results: A 150 µm thick disc was excised 150 µm below
Bowmans membrane and extracted through a keratotomy performed by the laser.
Sharp cut edges as well as the change in corneal thickness were observed
by slit-lamp biomicroscopy.
Conclusions: Ultra-short laser-Pulses are suitable for precise
intrastromal ablation.