Early term results of the stress-strain index in patients with keratoconus

Purpose To test the early term effect of corneal cross-linking (CXL) on the stress-strain index (SSI) in patients with keratoconus. Materials and Methods Medical records of 31 patients undergoing CXL were retrospectively evaluated before and at least 4 weeks after the procedure. All patients underwent complete ophthalmic examination including Corvis ST (OCULUS Optikgeräte GmbH; Wetzlar, Germany). The main outcome measures were SSI and other dynamic corneal response (DCR) parameters. Results The mean follow-up time was 53 ± 42 days (28 – 196). The SSI was significantly increased from 0.82 ± 0.17 at the postoperative to 0.91 ± 0.24 at the postoperative (p=0.002).Among the DCR parameters integrated inverse radius (IIR), time to reach the first aplannation (A1 time) and corneal deflection during this time (A1 Deflection) were significantly reduced (p<0.05). Central corneal thickness (CCT) was significantly reduced, -17.54 ± 15.17µm (p