Laser trephination of the cornea.

Hanspeter Loertscher, David Denham, Jean-Marie A Parel, Sid Mandelbaum

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A high degree of astigmatism is a frequency complication limiting visual acuity after cornea transplantations. The major surgical factor appears to be the difficulty in creating a truly round recipient opening due to distortion of the globe and the cornea resulting from the forces applied during manual trephination. A laboratory laser system has been developed that cuts circular buttons without deforming the cornea. It includes a pulsed hydrogen fluoride laser (wavelength, 2.7-3 μm), modified to produce a homogeneous beam and 50-ns pulses of 130 mJ at 10 Hz. With this laser it is possible to produce sharp corneal cuts with an approx. 50-μm wide zone of stormal tissue alteration adjacent to the excision. An optical system is mounted to focus each laser pulse into an annulus of approx. 100-μm width, the diameter of which can be varied from 5 to 8 nm. Using this system, laser trephinations could be produced in <10 s on human donor cornea.

Original languageEnglish
Title of host publicationUnknown Host Publication Title
Place of PublicationPiscataway, NJ, United States
PublisherPubl by IEEE
ISBN (Print)155752033X
StatePublished - Dec 1 1988

Fingerprint

Lasers
Optical systems
Laser pulses
Tissue
Wavelength
Hydrogen

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Loertscher, H., Denham, D., Parel, J-M. A., & Mandelbaum, S. (1988). Laser trephination of the cornea. In Unknown Host Publication Title Piscataway, NJ, United States: Publ by IEEE.

Laser trephination of the cornea. / Loertscher, Hanspeter; Denham, David; Parel, Jean-Marie A; Mandelbaum, Sid.

Unknown Host Publication Title. Piscataway, NJ, United States : Publ by IEEE, 1988.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Loertscher, H, Denham, D, Parel, J-MA & Mandelbaum, S 1988, Laser trephination of the cornea. in Unknown Host Publication Title. Publ by IEEE, Piscataway, NJ, United States.
Loertscher H, Denham D, Parel J-MA, Mandelbaum S. Laser trephination of the cornea. In Unknown Host Publication Title. Piscataway, NJ, United States: Publ by IEEE. 1988
Loertscher, Hanspeter ; Denham, David ; Parel, Jean-Marie A ; Mandelbaum, Sid. / Laser trephination of the cornea. Unknown Host Publication Title. Piscataway, NJ, United States : Publ by IEEE, 1988.
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