Effect of excimer laser beam delivery and beam shaping on corneal sphericity in photorefractive keratectomy.
作者： Bert Müller , Thomas Boeck , Christian Hartmann
DOI: 10.1016/S0886-3350(03)00559-5
关键词:
摘要: Abstract Purpose: To evaluate the impact of beam delivery and shaping on corneal profiles after myopic excimer laser photorefractive keratectomy (PRK). Setting: Department Ophthalmology, Charite-Campus Virchow Hospital, Humboldt University Berlin, Germany. Methods: Standard 193 nm PRK −3.0 diopters (D) −6.0 D was performed in porcine eyes using 2 commercially available broad-beam lasers with band-mask fractal-mask shaping, flying-spot lasers, a scanning-slit laser. A silicone replica obtained to preserve profile measured dynamic focusing topometry system. Results: The created uniform comparable those an untreated control group. Both central islands paracentral valleys 15.10 μm 17.00 maximum height 26.45 24.31 PRK. An anti-central-island program, which applied series pulses centrally compensate for elevations, did not eliminate islands. Stromal surface roughness increased ablation depth significantly worse than ablation. Conclusions: Laser-induced deviations from intended were associated therefore lessened predictability refractive outcomes. Scanning-slit systems produced predictably profiles.
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