TY - GEN
T1 - Laser trephination of the cornea.
AU - Loertscher, Hanspeter
AU - Denham, David
AU - Parel, Jean Marie
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.
UR - http://www.scopus.com/inward/record.url?scp=0024139389&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0024139389&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0024139389
SN - 155752033X
T3 - CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7
BT - CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7
PB - Publ by IEEE
ER -