Purpose: To study long-term changes in posterior corneal elevation after laser in situ keratomileusis (LASIK) using Scheimpflug topography (Pentacam, Oculus, Inc.) in eyes 1 year after LASIK. Setting: Department of Ophthalmology, Albany Medical Center, and a private practice, Albany, New York, USA. Methods: One hundred two myopic eyes of 52 consecutive patients presenting for their 1-year follow-up were prospectively evaluated using the Pentacam to determine elevation changes to the posterior corneal surface between preoperative and 1-year postoperative measurements. Changes in posterior elevation were performed by comparing the best-fit sphere preoperatively and postoperatively with a fixed reference sphere determined by the central 9.0 mm preoperative cornea. Statistical and graphical analyses were performed. Results: One hundred two post-LASIK eyes (mean correction -4.33 diopters; mean ablation depth 68.70 μm; mean estimated residual bed thickness 327 μm) had a mean posterior displacement of -0.47 μm ± 3.48 (SD) (range -10.0 to +7 μm). The mean follow-up period was 13.6 months (range 8.8 to 19.3 months). Conclusions: In this population, no patient had significant forward protrusion of the posterior corneal surface a mean of 14 months after LASIK. The posterior cornea in post-LASIK myopic eyes was very stable. Contrary to results in previous studies, progressive changes to the posterior corneal surface did not routinely occur after LASIK performed within established parameters.
ASJC Scopus subject areas
- Sensory Systems