title: Corneal ablation by nanosecond, picosecond, and femtosecond lasers at 532 and 625 nm.
abstract: We produced corneal excisions with nanosecond (ns)-, picosecond-, and femtosecond (fs)-pulsed lasers at visible wavelengths. The threshold energy for ablation was proportional to the square root of the pulse duration and varied from 2.5 microjoules (microJ) at 100 fs to 500 microJ at 8 ns. Excisions made with picosecond and femtosecond lasers was ultrastructurally superior to those made with nanosecond lasers and, at pulse energies near threshold, showed almost as little tissue damage as excisions made with excimer lasers at 193 nm. We conclude that ultrashort-pulsed lasers at visible and near-infrared wavelengths are a possible alternative to excimer lasers for corneal surgery and might have advantages over conventional ophthalmic neodymium-YAG lasers for some intraocular applications.
authors.affiliation: Laser Research Laboratory, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA.
authors.forename: D
authors.initials: D
authors.lastname: Stern
authors.forename: R W
authors.initials: RW
authors.lastname: Schoenlein
authors.forename: C A
authors.initials: CA
authors.lastname: Puliafito
authors.forename: E T
authors.initials: ET
authors.lastname: Dobi
authors.forename: R
authors.initials: R
authors.lastname: Birngruber
authors.forename: J G
authors.initials: JG
authors.lastname: Fujimoto
mesh_terms: D000818:Animals; D002417:Cattle; D003315:Cornea / Q000473:pathology / Q000601:surgery* / Q000648:ultrastructure; D053685:Laser Therapy; D008854:Microscopy, Electron; D013997:Time Factors