Evaluation of Pupillary Distance (PD) Measurement using Smartphone-based Pupilometer

Abstract

Measurement of the pupillary distance (PD) is one of the important steps of the spectacles-making process. PD measurement can be done using the PD Ruler, Auto-refractometer, and smartphones' apps. The study aims to evaluate PD measurement apps (Pupil Distance Meter Pro from Vistech Project, PD Pupil Distance for Eye Glasses and VR Headset from Glassify Me, and The Ultimate PD Rule) and compared them with Auto-refractometer as the gold standard. A total of 39 students (age 19-22) were involved in this study. The result of this study indicated that there was no difference between the measurement of the PD using the Glassify me app and the Auto-refractometer (p = 0.48). However, there was a mean difference of 0.2 mm between them. It could be concluded that the Glassify me app has the best accuracy compared to other apps (p value 0.48). This app was recommended to be used as an alternative to PD measurement.