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Proceedings Paper

Optimal laser parameters for intrastromal corneal surgery
Author(s): Ron M. Kurtz M.D.; Christopher Horvath; HsiaoHua Liu; Tibor Juhasz
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Paper Abstract

We characterized the effects of pulse duration, pulse energy, and spot separation on intrastromal corneal photodisruption to determine parameters that achieve optimal surface quality and tissue plane separation. Experiments utilized two laser systems, a 60 picosecond Nd:YLF laser and a 450 femtosecond Nd:Glass laser, both operating at 1.06 micrometers wavelength. Photodisruption was performed by tightly focusing the laser beam 150 microns below the tissue surface and scanning it in a spiral pattern to create a plane. A cut to the surface was made with the laser and the two surfaces separated to form a flap. Tissue plane separation was graded according to the additional mechanical dissection required. Internal surfaces were analyzed with standard histologic methods and scanning electron microscopy. We found that the Nd:YLF laser required approximately three times the pulse energy to achieve intrastromal cuts. Picosecond parameters also required more mechanical dissection and produced lower surface quality than optimal femtosecond parameters. We conclude that femtosecond laser pulses offer significant advantages that make them ideal candidate tools for high precision intrastromal corneal surgery. The flexibility in laser pulse delivery opens up a number of potential surgical applications not possible with current mechanical or laser devices.

Paper Details

Date Published: 18 May 1998
PDF: 11 pages
Proc. SPIE 3255, Applications of Ultrashort-Pulse Lasers in Medicine and Biology, (18 May 1998); doi: 10.1117/12.308209
Show Author Affiliations
Ron M. Kurtz M.D., Univ. of Michigan (United States)
Christopher Horvath, Univ. of Michigan and Univ. of Heidelberg (United States)
HsiaoHua Liu, Univ. of Michigan (United States)
Tibor Juhasz, Univ. of Michigan (United States)


Published in SPIE Proceedings Vol. 3255:
Applications of Ultrashort-Pulse Lasers in Medicine and Biology
Joseph Neev, Editor(s)

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