Frame Size: 48-20-138 MetroSunnies™ Con-Strain™ lens protect your eyes from the blue light emitted from digital screens. Long hours of screen exposure can be harmful to your eyes as it may cause digital eye strain and disrupt your sleep quality. Blue light is a high-frequency light wave between 380 - 485 nm. It is emitted from the digital screens of your smartphones and computers. PRO TIP: Wearing Con-Strain™ glasses may help you sleep better. What's in the package? - 1x MetroSunnies™ Eyewear - 1x MetroSunnies™ Designer Pouch - 1x Microfiber Lens Cleaner Note: Some Con-Strain™ lens have clear, bluish, yellowish or greenish tint when reflected in light.