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Femtosecond laser may yield better astigmatic keratotomy outcomes in patients with mixed astigmatism
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.