Pure 2 EyeGuard filters up to 43% of the more harmful artificial blue light emitted by electronic devices, protecting you from Digital Eye Strain. High energy, artificial blue light emitted by mobile devices can be the cause of Digital Eye Strain. Pure 2 EyeGuard filters up to 43% of the most harmful blue light wavelengths, while maintaining bright vibrant colors and protecting the screen from drops and scratches with case-friendly, edge-to-edge tempered glass. The blue tinge in the glass is what helps block the harmful light, but when its on your device it will not discolor the screen nor compromise clarity. The Advantage Program lifetime warranty means you can get free replacements if it ever chips or breaks, for the life of your device.