ScreenTime Billie Computer Glasses - Tortoise - PrescriptionDescription Features Blue Light Filter Daytime Computer Glasses Our ScreenTime Premium Daytime Filter Glasses are specifically designed for those spending significant periods of time during the day in front of screens. They feature our specialised ClearBlue Lenses, designed to filter out harmful, artificial blue light emitted by digital devices and all other artificial light sources. These blue light glasses for computer use filter 50% of blue light