Proper IOL power a tough call in refractive patients

Key Points

"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."