Product Name: Blue Light Blocking Glasses Non-Prescription Glasses -Glasses Overall Width: 139mm Lens Width: 50mm (1.97") Lens Height: 45mm Temple Length: 139mm Nose Spacing: 20mm. Applicable face shape: various face shapes Applicable people: unisex Style: Vintage Glasses weight: 17g Glasses frame material: metal Glasses frame color: bright black silver frame, sand black silver frame, tea gold frame, bright black gold frame Why do we need to filter blue light? Blue light is emitted from digital screens such as computers, tablets, laptops, TVs and cell phones. Overexposure to harmful blue light can cause eyestrain, fatigue and headaches. If you or your family and friends have this condition, get them a pair of blue light glasses as soon as possible. Reduce headaches Do you have a headache from using the screen for a long time? Blue light blocking glasses will enhance your health by blocking harmful blue light while letting in all other beneficial light. Better sleep Exposure to high-frequency blue light can affect our sense of circadian rhythm, disrupt our inner rock, and cause insomnia. Wearing blue light-filtering glasses will improve your sleep, helping you sleep better and feel better every day. Anti-eye fatigue Prolonged exposure to blue light can cause digital eyestrain. Blue light blocking glasses reduce eye strain and light sensitivity when facing digital screens and are ideal for office workers or anyone who has to look at a screen all day. ? Blue light blocking - Glasses lenses are designed with substrate absorption technology, which can absorb high-energy blue light. ? Anti-UV - The anti-blue lens adopts special substrate processing technology to protect eyes from UV radiation and block UV rays.{Worry-free after-sales service}?We believe in our products. If you have any questions about this product, please contact us. We will always be here to solve your problems. You try it without any risk!. {Sleep Better} - Wear blue light blocking glasses and you'll never have sleep problems again. It relieves eyestrain and headaches, allowing you to enjoy a restful, deep sleep. {Polycarbonate HD Lens Anti-Reflection} - Ultra-lightweight and flexible material ideal for long-term comfortable wear. This lens is anti-reflection, non-prescription lens without chromatic aberration, restore true color. You can also remove the lenses at any time and replace them with the prescription lenses you want. {Protect Your Eyes} - These blue light glasses can protect and reduce glare, relieve the visual fatigue and discomfort caused by long hours of surfing the web, gaming and working under fluorescent lights. {Reduce Eyestrain} - Enjoy your digital time without worrying about eye strain, blurred vision and headaches. Because glasses block the most harmful blue light from computers, phones and TVs.