Effect of Low-Level Light Therapy on Ocular Surface Parameters in Patients Undergoing Femto-Lasik Surgery

This study evaluates the role of perioperative low-level light therapy (LLLT) in reducing dry eye disease (DED) symptoms after femtosecond laser-assisted in situ keratomileusis (Femto-LASIK). DED is one of the most frequent complications following Femto-LASIK, potentially affecting both visual recovery and patient satisfaction. In this prospective, multicenter, randomized, double-masked, sham-controlled trial, adult patients undergoing Femto-LASIK were assigned to receive either periocular LLLT (Eye-light® )or sham treatment before and after surgery. Tear film parameters and ocular surface symptoms were assessed at baseline, 1 week, 1 month, and 3 months postoperatively. Results showed that patients treated with LLLT maintained stable tear volume and reported fewer ocular discomfort symptoms compared with controls, who experienced significant declines. No adverse events related to LLLT were observed. These findings suggest that perioperative LLLT is a safe and well-tolerated approach that may help preserve tear film stability and improve postoperative comfort in Femto-LASIK patients.