Purpose: To evaluate the efficacy, predictability, safety, and intraoperative
and postoperative complications of laser in situ keratomileusis
(LASIK) retreatment in myopic eyes using wavefront-guided ablation with
iris registration (IR).
Methods: Retrospective analysis was used to evaluate wavefront-guided
retreatment with IR in a consecutive cohort of 77 eyes (57 patients) after
LASIK. The eyes were divided into two groups: no previous retreatment
group (group 1) (n 63) and previous LASIK retreatment group (group 2)
(n 14). The primary outcome variables assessed postoperatively at 1, 3,
and 6 months were uncorrected visual acuity (UCVA), best-corrected
visual acuity (BCVA), and pre- and postretreatment changes in manifest
refraction.
Results: The mean preretreatment spherical equivalent in group 1 was
reduced from 0.5 1.0 diopter (D) (range 3 to 2.4) to 0.06 0.3
(range 0.9 to 0.6) (P 0.002) at 6 months. In group 2, the mean
preretreatment spherical equivalent was reduced from 0.9 1.24D
(range 3.1 to 0.5) to 0.04 0.5 (range 1.0 to 1.1) (P 0.049) at 6
months. At 6 months, UCVA was 20/20 or better in 92% in group 1 and 64%
in group 2, of patients, respectively. No eyes lost more than one line of BCVA
in group 1 and one eye (7%) lost two lines of BCVA in group 2.
Conclusion: Wavefront-guided LASIK retreatment with IR after LASIK
is an effective, predictable, and safe procedure in cases requiring a single
retreatment. In contrast, eyes with previous retreatments showed less
predictability and lower percentage of eyes with postoperative 20/20
UCVA.