π€ AI Summary
This study addresses the high costs and limited applicability of traditional eye-tracking-based vision screening, which relies on screen calibration and precision equipment. We propose a low-cost, screen-calibration-free gaze acquisition framework using a GC308 near-infrared camera, integrating the Gaze Quest and Orlosky pipelines. Notably, this work introduces inter-frame gaze vector angular variation as a novel core screening metric, replacing conventional fixation accuracy. Experimental evaluations confirm the data acquisition stability of this configuration, yielding a mean inter-frame gaze angle variation of 28.2 degrees and an effective sampling rate of approximately 8 FPS. These findings demonstrate the feasibility and effectiveness of employing low-cost hardware for vision screening without screen calibration, offering a scalable alternative for resource-constrained settings.
π Abstract
This engineering study assesses gaze-assisted data acquisition during visual screening with a Gaze Quest implementation via webcam and GC308 near infrared camera with an Orlosky eye tracking pipeline. Ten subjects performed under both acquisition conditions. Accuracy of Tumbling E orientation, reported application logMAR value,and response latency were determined from keyboard responses and hence are behavioral outputs as opposed toeye tracker screening results. Frame-to-frame change in theangle between successive normalized gaze vectors (28.2degrees) served as the GC308 eye tracker derived diagnostic with an effective sampling rate of roughly 8 FPS. No screen target calibration or gaze to screen translation was done on the GC308 eye tracker output data for the current analysis and hence, these data represent acquisition stability and not gaze accuracy in relation to the target. The webcam pipeline relied on 25-point screen calibration. Because the display resolution and pixel pitch could not be retained in the records of the study, the reported application logMAR values cannot be viewed as measures of visual acuity in any way.