IntraLase-Enabled Astigmatic Keratotomy for Postkeratoplasty Astigmatism

Purpose

To report on the outcomes of IntraLase-enabled astigmatic keratotomy (IEAK) and to compare it with manual astigmatic keratotomy (AK) for the management of postkeratoplasty astigmatism.

Design

Retrospective, comparative case series.

Methods

Forty eyes of 39 patients treated at a cornea clinic at the Toronto Western Hospital were included. Twenty eyes underwent manual AK and 20 eyes underwent IEAK. The main outcome measures included preoperative and postoperative manifest refraction, uncorrected and best-corrected visual acuity (UCVA, BCVA), corneal topography, high-order ocular aberrations, and complications.

Results

In the manual AK group, UCVA (logarithm of the minimum angle of resolution) improved from 1.08 ± 0.29 before surgery to 0.93 ± 0.45 after surgery (P = .09), and in the IEAK group, UCVA improved from 1.14 ± 0.42 before surgery to 0.82 ± 0.44 after the procedure (P = .004). BCVA improved from 0.63 ± 0.40 to 0.44 ± 0.38 (manual AK; P = .16) and from 0.52 ± 0.38 to 0.29 ± 0.26 (IEAK; P = .01), respectively. Mean cylinder reduction was 3.23 ± 4.69 diopters in the manual AK group and 4.26 ± 1.72 diopters in the IEAK group (P = .36). Two eyes in each group lost one line of BCVA. Three patients (15%) in the manual AK group had corneal perforation and required resuturing of the AK wound (P = .23) Overcorrection occurred at a similar rate in the two groups.

Conclusions

Treatment of postkeratoplasty astigmatism with IntraLase is a safe and effective surgical procedure and resulted in a significant improvement in UCVA and BCVA compared with manual AK. A larger sample series is needed to refine further this new technique of AK and to compare it with accepted manual techniques.