Comparative analysis of incidence of dry eye syndrome after ReLEx SMILE and FemtoLASIK keratorefractive surgeries
The main factor in pathogenesis of postoperative dry eye syndrome (DES) is damage to subbasal nerve plexus and stromal nerve endings. Taking into account the different principles of photorefractive effect on cornea of FemtoLASIK and ReLEx SMILE technologies, we decided on our own clinical experience to evaluate incidence of this undesirable complication. Purpose. Comparative study of frequency and timing of relief of postoperative DES after FemtoLASIK and ReLEx SMILE in patients with myopia. Material and methods. The study involved 32 patients (64 eyes) with varying degrees of myopia. The patients were divided into 2 groups: 1st group - 17 patients (34 eyes) after FemtoLASIK surgery, 2nd group - 15 people (30 eyes) after ReLEx SMILE procedure. Control group consist of 15 patients with comparable myopia who had not undergone refractive surgery was also observed. Patients underwent an assessment of the OSDI index, Norn and Schirmer tests, as well as degree of staining of anterior ocular surface 1, 6 and 12 months after refractive surgery. Results. There was statistically significant difference in total tear production, in tear breakup time (TBUT) and in the OSDI index between study groups 1 month after surgery in favor of ReLEx SMILE procedure. After 6 months, TBUT after FemtoLASIK significantly differed from control values. 12 months after surgery, studied parameters did not differ significantly from control. Conclusion. According to our datas, ReLEx SMILE procedure has lower negative effect on ocular surface compared to FemtoLASIK technique, which is manifested by less pronounced subjective symptoms of DES, as well as their faster relief. Key words: dry eye syndrome, ReLEx SMILE, FemtoLASIK.