Are Sunglasses Proper for Driving? Investigation and Prototype for Public Testing

Abstract Background: Sunglasses safety is important regarding driving conditions and is requirement of sunglasses standard ISO 12312-1, for testing traffic light and visible transmittances on lenses. Methods: We have spectroscopically investigated 232 sunglasses regarding compliance with standard, in the 380 nm – 780 nm range, with 5nm steps. Category (0 – 4) were determined as well as Q factors, which evaluate color distortion for the vision on sunglasses. Furthermore, we developed a prototype for public to self-check sunglasses regarding safety for driving. Combination of white light illumination, 4-channels photo sensor detection and calculation, allows testing simultaneously the colors of traffic light, as well as the visible light transmittances (categories). Q factors are provided by the prototype. Results: Spectroscopy shows that 75.43% complies with ISO 12312-1:2013. Prototype was validated by testing 232 sunglasses, with trained user and 60 from this set were double-checked with non-trained users, and compared to spectroscopic measurements. Bland-Altman analysis presented non-significant biases and narrow 95 % limits of agreement within pre-defined tolerances, for all measurements. Only 2 samples differed in category measurement. Conclusions: Sunglasses on the market should adjust for driving conditions. Prototype it is a fine set up for guiding users on checking proper sunglasses for safe driving Significance: Immediate attention on checking sunglasses for driving conditions is needed.