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註釋Ophthalmologic applications based on laser excimer technology have continued to evolve rapidly. This report updates a 1997 assessment of the benefits & drawbacks of one such technology, photorefractive keratectomy (PRK), in light of the developments that it has undergone. It also examines a more recent technology, laser in situ keratomileusis (LASIK), in considerable detail and assesses its efficacy & complications in the treatment of myopia and hyperopia. An introductory section summarizes ocular anatomy and the main refractive errors that may be found in patients. After discussing patient satisfaction with laser excimer treatments and the resulting optical quality of vision, the report examines the indications & contraindications of PRK & LASIK and the criteria for choosing between the two procedures. It also looks at alternatives, future developments, and research in this field. Finally, specific & general conclusions are offered concerning the applications of the excimer laser. Appendices include explanation of the general principles of excimer laser surgery.