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photorefractive effect |
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photorefractive effect [‚fōd·ō·ri′frak·tiv i′fekt] (optics) An effect displayed by many electrooptic materials in which a change in the index of refraction is induced by the presence of light, and this change is retained for a time after the light exposure ceases. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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These corneal sculpting techniques are known as photorefractive keratectomy and in situ keratomileusis (PRK and LASIK respectively). Two common procedures are photorefractive keratectomy, or PRK; and laser in-situ keratomileusis, or LASIK. The pot of gold in front of both groups is a relatively new - and expensive - laser procedure known as photorefractive keratectomy, which corrects nearsightedness by slightly flattening the cornea. |
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