Quantitation of corneal ablation by ultraviolet laser light
R. R. Krueger and S. L. Trokel
A surgical role has been suggested for the excimer laser. This followed the
discovery of precision etching of biological materials by the laser's
ultraviolet emissions. In studying the amount of tissue removed as the
laser energy density (irradiance) was varied, we found significant
differences for the 193-, 249-, and 308-nm laser emission lines. The most
efficient cutting irradiance for each pulse appeared to be about 200
millijoules/sq cm for 193 nm, 1,000 millijoules/sq cm for 249 nm, and 1,500
millijoules/sq cm for 308 nm. The flat slope of the etch depth curve for
193 nm suggests it will be a stable frequency when used clinically.
