Factors affecting corneal hysteresis in normal eyes

Background To evaluate factors affecting corneal hysteresis (CH) in normal eyes. Methods We examined 86 normal eyes of 43 healthy volunteers (age, 39.1 ± 14.5 years (mean ± standard deviation); range, 19 to 68 years; gender, 26 men, 60 women; manifest refraction, −2.25 ± 2.89 diopters (D); range, −9.13 to 3.88 D). We quantitatively assessed the value of CH using an Ocular Response Analyzer™ (Reichert Ophthalmic Instruments). We carried out this measurement three times, and the average value was used for statistical analysis. Multiple regression analysis was used to assess the relevant factors of the CH. Results The mean CH was 10.2 ± 1.3 mmHg. Explanatory variables relevant to the CH were, in order of magnitude of influence, the central corneal thickness (CCT) (partial regression coefficient B = 0.022, p