In 1981, Rangaswamy Srinivasan working at IBM Research Lab discovered that an ultraviolet excimer laser could etch living tissue in a precise way with no thermal damage to the surrounding area. He named the phenomenon Ablative Photodecomposition (APD). Srinivasan and his co-inventors performed tests using the excimer laser and a conventional, green laser to etch organic matter. They discovered that while the green laser produced rough incisions, damaged by charring from the heat, the excimer laser produced clean, neat incisions. In 1983, Srinivasan worked with an ophthalmic surgeon to develop APD to etch the cornea.
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Results are generally not as good in patients with very large refractive errors of any type. You should discuss your worries with your doctor and realize that you could still need glasses or contacts after the surgery.
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You may be under treated or over treated. Only a certain percent of patients achieve 20/20 vision without spectacles or contacts. You may require additional operation, but additional surgery may not be possible. You may still need glasses or contact lenses after procedure. This may be true even if you only required a very weak prescription before surgery. If you used reading glasses before treatment, you may still need reading glasses after operation.
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