Performing femtosecond laser intrastromal astigmatic keratotomy in patients with low mixed astigmatism improved refractive error after other refractive surgical methods were less successful, a study found.
The retrospective study included 112 eyes with low mixed astigmatism after previous refractive surgery that then underwent intrastromal astigmatic keratotomy. Patients were divided into two categories: those who underwent previous excimer laser surgery (47 eyes) and those who did not (65 eyes).
Mean patient age was 56 years and average follow-up was 7.6 years.
Overall, mean logMAR uncorrected distance visual acuity improved from 0.18 to 0.02 in both groups (P < .01). Mean logMAR corrected distance visual acuity also improved in both groups from −0.03 to −0.05 (P = .06). Mean subjective cylinder reduced from 1.2 D preoperatively to 0.55 D postoperatively (P < .01).
Nomogram refinement may help improve the predictability and effectiveness of this method, the authors said.