Abstract • Ablation of the bovine crystalline lens was studied using radiation from an excimer laser at four ultraviolet wave lengths as follows: 193 nm (argon fluoride), 248 nm (krypton fluoride), 308 nm (xenon chloride), and 351 nm (xenon fluoride). The ablation process was quantitated by measuring mass ablated with an electronic balance, and characterized by examining ablation craters with scanning electron microscopy. The highest ablation rate was observed at 248 nm with lower rates at 193 and 308 nm. No ablation was observed at 351 nm. Scanning electron microscopy revealed the smoothest craters at 193 nm while at 248 nm there was vacuolization in the crater walls and greater disruption of surrounding tissue. The craters made at 308 nm did not have as smooth a contour as the 193-nm lesions. The spectral absorbance of the bovine lens was calculated at the wavelengths used for ablation and correlated with ablation rates and thresholds. High peak-power, pulsed ultraviolet laser radiation may have a role in surgical removal of the lens. References 1. Trokel SL, Srinivasan R, Braren B: Excimer laser surgery of the cornea . Am J Ophthalmol 1983;96:710-715. 2. Puliafito CA, Steinert RF, Deutsch TF, et al: Excimer laser ablation of the cornea and lens . Ophthalmology 1985;92:741-748.Crossref 3. Krueger RR, Trokel SL: Quantitation of corneal ablation by ultraviolet laser light . Arch Ophthalmol 1985;103:1741-1742.Crossref 4. Peyman GA, Kuszak JR, Weckstrom K, et al: Effects of XeCl excimer laser on the eyelid and anterior segment structures . Arch Ophthalmol 1986;104:118-122.Crossref 5. Pellin MJ, Williams GA, Young CE, et al: Endoexcimer laser intraocular ablative photodecomposition . Am J Ophthalmol 1985;99:483-484. 6. Lane RJ, Linsker R, Wynne JJ, et al: Ultraviolet-laser ablation of skin . Arch Dermatol 1985;121:609-617.Crossref 7. 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Archives of Ophthalmology – American Medical Association
Published: Dec 1, 1986
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