This year, an estimated 1.5 million nearsighted Americans will trust their eyes to laser-wielding surgeons. While the so-called LASIK (laser-assisted in-situ keratomileusis) procedure carries risks, many will toss their glasses and give thanks to their doctors. What they don’t know is that a leftover Thanksgiving turkey deserves credit too.
Just a few years after the 1960 invention of the laser, doctors began to use the new tool in eye surgeries, burning off tumors, for example, or “welding” torn retinas back together. But the technology of the 1960s and 1970s wouldn’t have allowed surgeons to operate on the cornea-the clear front portion of the eye whose curvature helps determine whether a person is nearsighted, farsighted or has eagle eyes-because the colors of laser light available at the time passed right through clear materials without doing anything to them. What’s more, because the first-generation lasers worked by heating tissue, they left scars.
But in 1977, the German company Lambda Physik marketed the “excimer laser,” which beamed out ultraviolet (UV) light, capable of cutting transparent materials. Within a couple of years, a chemist named Rangaswamy Srinivasan at IBM’s Research Division noticed another interesting fact about the new laser: Instead of burning a plastic material he aimed it at, the UV light etched a clean groove. Srinivasan brought his finding to his manager, James J. Wynne, and in October 1981, Wynne, Srinivasan and colleague Samuel Blum had a brainstorm: If the excimer laser was used in surgery, it might make incisions that would heal without scars.
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