Repeatability of Ocular Biomechanical Data Measurements With a Scheimpflug-Based Noncontact Device on Normal Corneas

Abstract

any of the instruments used in this study. Flattest and steepest keratometric data and also IOP showed highly significant correlation with the ten specific CorVis ST parameters. Conclusions:The novel technique measuring ocular biomechanical properties showed high repeatability for only IOP and pachymetric data determined in our study. Single measurements are not reliable in case of the ten device-specific parameters. The equipment allows for conducting clinical examinations, and screenings of surgeries altering ocular biomechanical properties with some form of averaging of multiple measurements.

Evaluation of the relationship of corneal biomechanical metrics with physical intraocular pressure and central corneal thickness in ex vivo rabbit eye globes

“…The study has shown high repeatability in CCT measurements by the CVS, which is consistent with the results of Nemeth et al (Hon and Lam, 2013;Nemeth et al, 2013). With pressure increases, the cornea was stretched and a statistically significant decrease in CCT was observed of approximately 5% over the pressure increase from 7.5 to 37.5 mmHg.…”

“…For the CVS metrics, A1T, HCT, PD, HR and DA maintained an acceptable repeatability (ICC above 0.39) with DA showing the highest measurement stability at all pressure stages. Compared to previous studies with a mean IOP around 15 mmHg (Hon and Lam, 2013;Nemeth et al, 2013), the repeatability of the present CVS metrics was slightly stronger, possibly with the exceptions of A2L and A2T. These findings will be important when selecting metrics that are strongly associated with IOP and the cornea's material behavior, and where repeatability of measurements is essential for the reliability of pressure and behavior estimations.…”

Examination of ocular biomechanics with a new Scheimpflug technology after corneal refractive surgery

“…According to the literature, the repeatability and reproducibility data were poor for most of the CorVis ST parameters except for intraocular pressure, pachymetric data, deformation amplitude and first applanation time [14,15], although second applanation time, highest concavity time, and radius data had low coefficient of variation values [15]. In our examinations, all measurements were performed by the same investigator to eliminate the possible interobserver variability.…”

Can retinoscopy keep up in keratoconus diagnosis?

“…In the other stages the matching is mostly less than 50%. measure biomechanical properties [15,16]. ORA in the newest software version 3.0 provided an additional keratoconus diagnostic module, which is under test in many current publications [9,[17][18][19][20].…”