Prospective Multicenter Observational Study for Clinical Validation of AI-Based Quantitative Eye Movement Analysis Using Smartphone-Recorded 9-Gaze Videos

Ocular motility is commonly evaluated using the 9-gaze examination, which relies on clinician observation and semi-quantitative grading. This approach is inherently subjective and can show inter-observer variability and limited sensitivity to subtle changes over time. Objective, quantitative assessment of eye movement remains an unmet clinical need, particularly for monitoring disease progression and treatment response.

Recent advances in artificial intelligence have enabled automated analysis of facial and ocular features from smartphone-recorded videos, offering the potential for reproducible quantitative measurement of eye movement. Glandy EOM is an investigational software-only medical device (SaMD) developed by THYROSCOPE INC. that processes smartphone-recorded 9-gaze videos to generate quantitative eye movement metrics. Glandy EOM has not yet received regulatory approval and is used for research purposes only in this study.

The study is a prospective, multicenter, multinational observational investigation designed to evaluate the clinical validity of Glandy EOM. The study population consists of adults with suspected or confirmed ocular motility abnormalities; healthy volunteers without any clinical indication for 9-gaze examination are not enrolled. Because eligibility is based on clinical suspicion or diagnosis of ocular motility abnormality rather than confirmed disease at enrollment, some participants may ultimately be clinically judged to have no abnormality on formal evaluation; such subjects remain part of the study population. Participants will undergo a single study visit consisting of (1) a standard clinical 9-gaze examination with clinician grading (-4 to +4), (2) a smartphone video recording performed with the assistance of a trained operator using a standardized setup, and (3) a patient self-recorded smartphone video acquired through the study mobile application.

For quantitative reference measurements, independent rater-derived measurements will be obtained from the recorded videos using a calibrated reference approach. A calibration marker of known size will be placed on the glabella during video acquisition to enable real-world scale estimation for the reference measurements. The calibration marker is used only for rater-based reference measurement and is not used by the AI algorithm.

The primary objective is to evaluate agreement between AI-derived quantitative eye movement metrics and rater-derived measurements of corneal center displacement, expressed as distance (mm) and angular deviation. Secondary objectives are to evaluate correlation between AI-derived metrics and clinician-assessed 9-gaze grading, and to evaluate whether AI-derived metrics obtained from patient self-recorded videos are comparable to those obtained from assistant-aided recordings. The investigational device is used solely for video acquisition and analysis and does not influence clinical decision-making during the study.