After about a year, I had blurriness in one eye: but only in the upper quarter. I went back to the surgeon, who explained that when the old lens was pulverized and removed, tiny remnants remained (they can never remove 100%). It developed a layer of scar tissue that occurred about 10% of the time. The solution is a brilliant machine that uses a very precise laser to perforate the tissue layer into four sections (like a 4-slice pizza); and the sections, over the next couple of days, just roll up into the eyeball and out of the field of view. It was a 2-minute procedure! Once that's done, it never has to be done again.