研究目的
To develop and test offline tools for detecting the presence and direction of the optokinetic reflex in children using consumer grade video equipment, aiming for an objective measurement of visual function in young children.
研究成果
The developed tools and methods effectively detected OKN presence and direction in children using consumer grade equipment, showing high sensitivity and specificity. This suggests potential for clinical application in assessing visual function in young children.
研究不足
The study faced challenges with very large head and body movements and instances where a care-giver’s hand obscured the face and eyes. The methods were also computationally expensive and required manual selection of the face region.
1：Experimental Design and Method Selection:
The study employed offline tools to analyze video footage of children viewing stimuli that induced horizontal OKN. Methods included head tracking, head stabilization, and pupil center and limbus edge tracking.
2：Sample Selection and Data Sources:
Video footage from five children (ages 21-25 months) with normal vision was used, totaling 20 trials.
3：List of Experimental Equipment and Materials:
Consumer grade video equipment, random dot kinematograms presented on a cathode ray tube monitor, and MATLAB with Psychtoolbox for stimulus generation.
4：Experimental Procedures and Operational Workflow:
Videos were recorded as children viewed drifting stimulus patterns. Head tracking and stabilization were performed, followed by pupil and limbus edge tracking to estimate eye movement.
5：Data Analysis Methods:
Eye velocity signals were analyzed to detect OKN presence and direction, comparing results with those from an experienced observer and a clinically trained assessor.
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