Mid-infrared laser ablation of the cornea: a comparative study.
The ablation thresholds and patterns of collateral damage in cornea produced by Er:YAG (2.94 microns) and Er:YSGG (2.79 microns) lasers were measured. Two different pulse durations, 200 microseconds (normal spiking mode) and 100 ns (Q-switched mode), were used at both wavelengths. In the normal spiking mode, damage zones of 16 +/- 2 microns and 39 +/- 7 microns and ablation thresholds of 250 +/- 20 mJ/cm2 and 420 +/- 35 mJ/cm2 were measured at 2.94 microns and 2.79 microns, respectively. In the Q-switched mode, damage zones of 4 +/- 2 microns and ablation thresholds of 150 +/- 10 mJ/cm2 were found irrespective of the laser used. The similarity between the results using the Er:YAG and Er:YSGG lasers in the Q-switched mode suggest that either laser can be used with equal effectiveness for corneal trephination.
Ren
Q
Q
Opthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami School of Medicine, Florida 33136.
Venugopalan
V
V
Schomacker
K
K
Deutsch
T F
TF
Flotte
T J
TJ
Puliafito
C A
CA
Birngruber
R
R
D000818:Animals; D002417:Cattle; D003315:Cornea / Q000473:pathology / Q000601:surgery*; D008028:Light Coagulation / Q000379:methods*