Immediate changes in pupil size following Laser in situ keratomileusis (LASIK): Pupillometry study

Purpose: To investigate the impact of laser in situ keratomileusis (LASIK) on the change in pupil size immediately after the procedure. Methods: In a prospective study, measurement of pupil size was assessed in 70 eyes of 35 consecutive patients using a hand-held pupillometer before and immediately after LASIK in mesopic condition at the refractive eye center, Riyadh, Saudi Arabia. Results: The pupil showed mild dilation immediate after LASIK. Mean pupil size before LASIK was 4.10 ± 0.74 and immediate after was 4.74± 0.82, P value 0.0001. No association was found with age, sex, central corneal thickness or pre-operative refractive measurements (CCT). Conclusion: There is a change in pupil size that immerses immediately after LASIK; postulations suggested for pupillary dilation include the effect of suction ring, post-operative steroid eye drops, dark room, pain and anxiety.