Laser trephination of the cornea.

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

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


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 (US)
Title of host publicationCLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7
PublisherPubl by IEEE
Number of pages1
ISBN (Print)155752033X
StatePublished - Dec 1 1988

Publication series

NameCLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7

ASJC Scopus subject areas

  • Engineering(all)


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