Evaluation of corneal functional optical zone after laser in situ keratomileusis.
OBJECTIVE
To evaluate the corneal functional optical zone (FOZ) after laser in situ keratomileusis (LASIK) using a primary 6.0 mm ablation diameter without a transition zone.


METHODS
University-based practice.


METHODS
In this retrospective study, 76 eyes of 53 patients who had LASIK for myopia were evaluated. The size of the preoperative and postoperative FOZ was compared in each eye. Preoperative refraction, attempted correction, and achieved correction were correlated with the preoperative and postoperative FOZ using regression analysis.


RESULTS
After LASIK, the FOZ decreased a mean 1.2 mm +/- 0.67 (SD) (P < 0.0001). The size of the FOZ was correlated with the preoperative manifest refraction, attempted correction, and achieved correction (P <.0001). The FOZ reduction was significantly correlated with the preoperative manifest refraction, attempted correction, and achieved correction (P <.05). Before LASIK, there was no correlation between the FOZ and the preoperative manifest refraction (P = 0.9427).


CONCLUSIONS
Spherical aberrations exist within the laser ablation zone and are related to the amount of myopic treatment. This has implications for patients with large pupil diameters under mesopic conditions. Future studies are necessary to understand the implications in patients with high refractive errors.
Boxer Wachler
Brian S
BS
Jules Stein Eye Institute, UCLA Department of Ophthalmology, Los Angeles, California 90095, USA. bbw@jsei.ucla.edu
Huynh
Vu N
VN
El-Shiaty
Ayman F
AF
Goldberg
Damien
D
D000328:Adult; D000368:Aged; D003315:Cornea / Q000502:physiology*; D019781:Corneal Topography; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D011182:Postoperative Care; D011300:Preoperative Care; D012029:Refraction, Ocular / Q000502:physiology; D012189:Retrospective Studies; D014792:Visual Acuity / Q000502:physiology