[deminature]

LASIK in the 90s versus LASIK in 2019 is almost an entirely different procedure. Modern LASIK procedures involve mapping the eye on a microscopic level, evaluating vision acuity at hundreds of points on the eye surface, and then allowing an automated laser to perform the procedure. This is known as a wavefront-guided LASIK procedure and produces outstanding results.

LASIK in the 90s involved physically cutting the surface of the eye with a keratome (blade) and relied on the precision of the surgeon's hand.

[RantyDave]

And yet they still make a big deal of how you can come in for a "tune up" or whatever. If it's so accurate, how did I end up an entire diopter off target?