Volk eye check ocular measurement device for objective periorbital measurements: A prospective study

Volk Eye Check (VEC) is a portable digital ocular measurement device that automatically captures clinical photographs with facial measurements in real time (Volk Optical Inc), claiming to reduce measurement errors. The accuracy and repeatability of this ocular measurement device in the periorbital region has not been reported.

To report the reproducibility and repeatability of periocular biometric measurements using Volk Eye Check Ocular measurement device.

Prospective, single blind, comparative study. Two experts performed digital photography of 100 volunteers using the standard photography technique using Oculoplasty module of the Volk Eye Check ocular measurement device. Each expert photographed the volunteer twice, to obtain two sets of automated printouts of 13 periorbital biometrics that were measured automatically by the ocular measurement device. Bland Altman plot and multiple comparisons of means from linear mixed-effects model fit by REML using simultaneous contrasts with p values reported by Bonferroni method were used as statistical tests to analyze following parameters: MRD¹ (margin reflex distance-1), MRD² (margin reflex distance-2), PFH (palpebral fissure height), HVID (horizontal visible iris diameter), ALL (aperture length at lateral limbus), and ALM (aperture length at medial limbus).

The mean inter-observer difference in measurement (mm) was as follows: MRD1 (0.04), MRD2 (0.02), HVID (0.01), PFH (0.03), ALL (0.05), ALM (0.08). The mean intra-observer difference in measurement (mm) was as follows: MRD1 (0.02), MRD2 (0.09), HVID (0.0), PFH (0.09), ALL (0.06), ALM (0.05).

Periorbital biometric measurements using Volk Eye Check ocular measurement devices are highly reproducible and repeatable. The oculoplasty module of Volk Eye Check ocular measurement device can provide reliable periorbital measurements for routine clinical use and for objective clinical studies.