Abstract

Digital device usage has become ubiquitous in modern society, raising concerns about potential adverse effects on visual comfort and sleep quality due to prolonged exposure to blue light emitted by screens. This randomized controlled trial aimed to investigate the impact of blue light filtering contact lenses on visual comfort and sleep quality in digital device users. A total of 200 participants were randomly assigned to two groups: one wearing blue light filtering contact lenses and the other wearing conventional contact lenses without blue light filtering properties. Visual comfort was assessed using validated questionnaires, and sleep quality was evaluated using self-reported sleep parameters and actigraphy measurements over a four-week period. Results showed that participants wearing blue light filtering contact lenses reported significantly higher visual comfort scores compared to those wearing conventional contact lenses (p <0.05). Furthermore, subjective sleep quality improved in the blue light filtering contact lens group, with participants reporting fewer sleep disturbances and better overall sleep satisfaction compared to the control group (p <0.05). Actigraphy data revealed trends towards improved sleep efficiency and reduced nocturnal awakenings in the blue light filtering contact lens group, although these findings did not reach statistical significance. Our findings suggest that blue light filtering contact lenses may offer benefits in terms of visual comfort and sleep quality for digital device users. Further research with larger sample sizes and longer follow-up periods is warranted to confirm these findings and elucidate the underlying mechanisms.