<![CDATA[The increased use of digital devices in adolescents is at risk of causing Computer Vision Syndrome (CVS). This study aims to analyze the determinants of CVS complaints, including the duration of screen time, visual hygiene behavior, gender, and length of use of glasses, in adolescents at the Mencirim Tujuh Tujuh Eye Special Hospital, Medan. This cross-sectional study involved 103 adolescents aged 12–19 years who were selected by simple random sampling in July–August 2026. Screen time was measured from Digital Wellbeing/Screen Time for 7 days and laptop usage records. Visual hygiene behavior was measured with a 10-item questionnaire, and CVS complaints with CVS-Q Teen adaptation. The analysis used the Chi-Square test (α = 0.05), prevalence ratio (PR), and 95% confidence interval (CI). As many as 85.4% of respondents had risky screen time (>4 hours/day), 82.5% had poor visual hygiene behavior, and 64.1% experienced CVS complaints. CVS complaints were more frequent in risky screen time (p = 0.001) and in poor visual hygiene behavior (p = 0.001). Gender (p = 0.941) and length of glasses use (p = 0.928) were not related to CVS complaints. Duration of screen time and visual hygiene behavior were determinants of CVS complaints in adolescents, while gender and length of glasses use were not related. Limiting screen duration and visual hygiene education needs to be part of adolescent eye health services.]]>
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