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Arriving at the proper IOL power is difficult to achieve in patients who have undergone prior cornea-altering refractive procedures such as LASIK, PRK, or RK.
"You can see the problem," Dr. Holladay said. "When you have 16 D of variation over the surface, over the zone that you're measuring, it's hard to determine an exact power-and that's where all the math comes in. But all the math in the world can't make the precision or accuracy in a patient who has undergone RK equal to that we can achieve in an untreated cornea, because they're not even close to the same quality of surface."