Abstract
To assess the influence of intrastromal corneal ring segment (ICRS) implantation on corneal biomechanics in patients with keratoconus. Patients with keratoconus who underwent femtosecond laser-assisted ICRS (Keraring) implantation were evaluated with the ocular response analyzer (ORA). Metrics of corneal biomechanical parameters, including corneal hysteresis (CH) and corneal resistance factor (CRF) were measured both before and after surgery. The postoperative measurements recorded at the 1st, 3rd and 6thmonths, and 1st and 2ndyears after surgery were analyzed. The mean CRF was significantly lower in the early postoperative period (1st and 3rdmonth); however, the difference between the mean preoperative and late postoperative (6thmonths, 1st and 2ndyears) CRF values was not significant. There were no significant differences between the mean preoperative and postoperative CH values. In the early postoperative period a significant temporary decrease in CRF was observed after the femtosecond laser-assisted ICRS implantation; however, this surgery did not alter the CH significantly in the same time interval. Both CH and CRF did not show significant alteration from preoperative values in the late postoperative period.
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