Normal, current-day LASIK utilizes highly extensive corneal testing/mapping and uses complex devices and lasers. However, the actual info fed into the laser system is like a 1 word instruction or handover from all we gather during the extensive testing. The laser fires tens of thousands of bits of information into the cornea. To make this short, if you have had regular LASIK, this leads to potential issues in future eye surgeries that occur, like cataract surgery, and will affect what intraocular lens you will be able to wear or choose from at that point in time. When you need cataract surgery, you may not have the option of being able to choose from certain multifocal lenses.
Your eye works a lot like a camera. Light rays focus through your lens onto the retina at the back of the eye. Similar to photographic film, the retina allows the image to be “seen” and interpreted by the brain. Over time, the lens of our eye can become cloudy, preventing light rays from passing clearly through the lens. The loss of transparency of the lens may be so mild that vision is barely affected, or it can be so severe that no shapes or movements are seen. When the lens becomes cloudy enough to obstruct vision to any significant degree, it is called a cataract.