Long-Term Use of Blue Light-Filtering Glasses and Symptom Improvement in Digital Eye Strain: A Questionnaire-Based Study

This cross-sectional, questionnaire-based study aimed to evaluate the long-term effectiveness of blue light-filtering (BLF) spectacle lenses in alleviating symptoms of digital eye strain (DES) and to identify behavioral and demographic factors associated with symptom improvement. A total of 186 adults who had worn clear blue-filter lenses for at least 12 months were surveyed regarding the frequency and severity of ocular complaints. Logistic regression analysis identified predictors of symptom improvement, including screen time, adherence to the 20-20-20 rule, and lens use duration. A total of 158 (85.0%) participants reported improvement in at least one symptom, with dryness and eye fatigue being the most frequently improved. Significant predictors of symptom relief included adherence to the 20-20-20 rule (OR = 1.95, p = 0.045), daily screen time under six hours (OR = 0.45, p = 0.027), and lens use for ≥12 months (OR = 1.30, p = 0.040). Female gender and prolonged screen exposure were negatively associated with improvement. As a cross-sectional, self-reported study, the findings reflect subjective recall rather than prospective measurement but suggest that long-term use of clear blue-filter lenses, particularly when combined with visual hygiene practices such as the 20-20-20 rule and screen time moderation, is associated with reduced DES symptoms. The results support the combined use of optical and behavioral strategies in managing screen-related visual discomfort.