Word: wavefront
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There's a new Lasik in town. You remember the old Lasik, the eye operation that improves vision by reshaping the cornea with lasers. The new version is called wavefront-guided Lasik and depends on technology developed by astronomers to correct problems in high-powered telescopes. Wavefront Lasik uses 200 little lenses to map the cornea, taking into account all its bumps and abnormalities to produce a highly accurate, individualized prescription. Conventional Lasik, by contrast, applies one standard formula to each eye. If the old Lasik is off the rack, wavefront is a custom-fit procedure. Studies show that...
...Light moves slower in a denser medium. So when a "wavefront" of light passes at an angle from dense cold air into less dense warm air, the part that reaches the warm air first races ahead of the remainder. This "refraction" has the effect of bending the wave-front toward the cold...
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