Laser in situ keratomileusis to correct post-keratoplasty astigmatism; 1-step versus 2-step procedure.
OBJECTIVE
To investigate the correction of post-penetrating keratoplasty (PKP) astigmatism using laser in situ keratomileusis (LASIK). Visual and refractive outcomes were evaluated after LASIK was performed in 1 step (lamellar cut and ablation in 1 procedure) or 2 steps (lamellar cut then ablation in 2 successive procedures).


METHODS
Department of Cornea and Refractive Surgery, Vissum-Instituto Oftalmológico de Alicante, University of Miguel Hernández, Alicante, Spain.


METHODS
In this prospective observational study, 22 consecutive eyes were divided into 2 groups depending on the LASIK procedure performed to correct post-PKP astigmatism. Group 1 (1-step LASIK) included 11 eyes and Group 2 (2-step LASIK), 11 eyes. The patients were followed for 6 months.


RESULTS
A statistically significant improvement was obtained in Group 2 with a mean vector analysis result of the cylinder of -4.37 diopters (D) +/- 1.79 (SD) (P = .018). In Group 1, the mean astigmatism correction was 2.38 +/- 1.71 D. The number of reoperations and residual refractive defects were significantly better in Group 2.


CONCLUSIONS
The 2-step technique improved the accuracy of excimer laser correction of post-PKP astigmatism.
Alió
Jorge L
JL
Instituto Oftalmológico de Alicante, University of Miguel Hernández, Alicante, Spain. jlalio@oftalio.com
Javaloy
Jaime
J
Osman
Amr A
AA
Galvis
Virgilio
V
Tello
Alejandro
A
Haroun
Hazem E
HE
D000293:Adolescent; D000328:Adult; D000368:Aged; D001251:Astigmatism / Q000209:etiology / Q000601:surgery*; D019781:Corneal Topography; D005260:Female; D006085:Graft Survival; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D015948:Keratoplasty, Penetrating / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D012449:Safety; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology