Background/NeedSurgical loupe fogging caused by exhaled humid air significantly impairs operative visibility and precision. Existing surfactant-based antifogging agents provide only temporary effects and require repeated application.Methodology and Device DescriptionMoth-eye nanostructure technology was applied to the optical surface using a transparent processed film. The nanoscale pillar array induces superhydrophilicity through a purely physical mechanism, allowing condensed moisture to spread uniformly rather than forming light-scattering droplets.Preliminary ResultsUnder high-humidity conditions, untreated lenses showed marked loss of visual clarity. In contrast, moth-eye-processed lenses consistently preserved transparency, as supported by objective image-based "color count" assessment.Current StatusThis technology remains at the proof-of-concept stage and is not commercially available. Ongoing development focuses on direct nanoimprinting onto medical-grade optical devices and evaluation of long-term durability and clinical usability.
Tanishima et al. (2026) studied this question.