We have developed an experimental model to observe the course of suctioning and changes in IOP simultaneously. This model seems to be accurate in obtaining IOP values from the anterior chamber cavity during LASIK.

Purpose: To compare changes in high order corneal aberrations (HOCA) after myopic LASEK and LASIK surgeries using two different excimer lasers. Methods: This prospective study included 124 eyes of consecutive patients divided into 4 groups; group 1 LASEK with Technolas 24 eyes, group 2 LASIK with Technolas 26 eyes, group 3 LASIK with Esiris 37 eyes, group 4 LASEK with Esiris 37 eyes. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA) and manifest refraction were measured, in groups, before and 3 months after surgeries. The topography data were used to calculate HOCA with 6 mm pupil size, before and 3 months after surgery. Results: There were no significant differences, 3 months after surgery, in BCVA, UCVA and in manifest refraction between patients treated with LASEK and LASIK regardless of the laser used. There was a significant increase in spherical, astigmatic, coma and total RMS aberrations in Technolas groups 3 months after surgery. They were lower in LASIK than in LASEK (p< 0,001). The same results were found in spherical and high order aberrations in Esiris groups (p: 0.001; p: 0.06). There were also higher in LASEK, 3 months after surgery. Conclusions: : Our results suggest that both lasers produced an equal increase in HOCA. Therefore, it depends on the surgical technique used. HOCA after LASEK were higher than after LASIK 3 months after surgery.