Fig. 1

a Attempted versus achieved spherical equivalent (SEQ). Blue line indicates attempted = achieved. Green lines indicate ±0.50 D. Pink lines indicate ±1.00 D. b Postoperative cumulative Snellen UDVA compared with pre-LASIK CDVA. c Postoperative refractive astigmatism accuracy compared with pre-LASIK. d TIA vector vs. SIA vector for pre- and post-LASIK. Blue line indicates TIA = SIA, green lines indicate ±0.50D, pink lines indicate ±1.00D. e Postoperative change in Snellen lines of CDVA compared with pre-LASIK CDVA. f Spherical equivalent (SEQ) stability from before LASIK to 1, 3, 6 and 24 months after LASIK