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 language | English |
|---|---|
| Title of host publication | Unknown Host Publication Title |
| Place of Publication | Piscataway, NJ, United States |
| Publisher | Publ by IEEE |
| ISBN (Print) | 155752033X |
| State | Published - Dec 1 1988 |
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ASJC Scopus subject areas
- Engineering(all)
Cite this
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 proceeding › Conference contribution
}
TY - GEN
T1 - Laser trephination of the cornea.
AU - Loertscher, Hanspeter
AU - Denham, David
AU - Parel, Jean-Marie A
AU - Mandelbaum, Sid
PY - 1988/12/1
Y1 - 1988/12/1
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:0024139389
SN - 155752033X
BT - Unknown Host Publication Title
PB - Publ by IEEE
CY - Piscataway, NJ, United States
ER -