An Objective and Automated Method to Measure Eye Alignment

Abstract

A novel method to measure the manifest and latent angles of eye misalignment (ETBT) is presented. The method is based on a stereocamera remote eye-gaze tracking system that estimates the position of the center of curvature of the cornea and the direction of the optical axis of the eye without subject calibration. The performance of ETBT was compared with the gold standard clinical test (APCT) in 12 adult subjects. The comparison between ETBT and APCT demonstrated a good agreement of 0.54±2.75∆ for horizontal angles and −0.5±2.52∆ for vertical angles. The repeatability of ETBT was within 0.67±2.74∆ for horizontal angles and −0.44±2.19∆ for vertical angles, which is slightly better than the reported repeatability of APCT. Since ETBT requires limited subject cooperation, it might be suitable for infants and young children.