Excimer retreatment for undercorrection of regression after laser in situ keratomileusis

The purpose of this study was to evaluate the results of excimer retreatment for undercorrection or regression after laser in situ keratomileusis [LASIK]. Forty-six eyes received retreatment for undercorrection or regression after first LASIK. The mean manifest spherical equivalent was -2.67 +/- 0.76 D [range -1.0 to -3.75 D]. Retreatment was performed 3 to 16 months after primary LASIK [mean 5.7 +/- 2.9 months]. Retreatment was performed either by lifting the previously created flap or when this was not possible, cutting a new flap. The mean follow up after retreatment was 12.8 +/- 5.1 months. The mean age of the patients was 39 +/- 7.3 years. Proper evaluation of the patients, pre and post-operative, was done. This evaluation included UCVA, BCVA, manifest refraction, slit-lamp biomicroscopy, keratometry, tonometry, pachymetry, fundus examination and corneal topography. The study concluded that retreatment of residual myopia or regression was relatively safe and predictable, with a low risk of sight-threatening complications. However, longer- term studies may be required to detect late complications