Photochromic Design - The magical photochromic lenses are based on the intensity of sunlight and ultraviolet lights. Clear blue light lenses change into brown or grey. Protect your eyes from harmful blue light when you watch TV, look at computer, tablet, smartphone or other electronic devices Anti-blue light Lens- JM square Pilot blue light blocking eyeglasses can filter 90% blue rays, reduce eyestrain, prevent eye dry, minimize headache and make you sleep better Dimension:Lens width:58mm/2.28inch, Lens Height: 44mm/1.73inch, Bridge width:15mm/0.59inch, Arm length:140mm/5.51inch 30 Day Money Back Guarantee: All JM customers enjoy 30 Day Money Back Guarantee. Customers can return and get refunded in case the purchasing is not satisfactory for any reasonColor: Gold Frame / Clear Into Brown Lens Model Number: PN1004C9 Part Number: PN1004C9 Size: 58mm x 44mm (lens), 140mm (arm length)JM Vintage Square Pilot Computer Reading Glasses Gaming Eyeglasses Anti Blue Light Lens for Digital Screens Blue light blocking Pilot computer glasses, protect your eyes for long time watching computers, TV or phones. MATERIAL: Frame: metal Lenses: Anti-blue light lens FEATURES: What a blue light blocking glasses can do: Anti eye fatigue: Reduce eye strain and sensitivity to light when facing digital screens. Great for office workers or anyone who has to look at screen all day. Minimize headache: Blue light blocking glasses will supercharge your health by blocking detrimental blue light while letting in all other beneficial light. Sleep better: Exposure to high rate blue light will impact our sense of circadian rhythms cause insomnia. Wearing blue light filter glasses will improve your sleep, help you sleep better and have good night. Anti blue lenses: Protect your eyes. Blocks 90% of high energy blue light. Relieve eye fatigue caused by longtime use of electronic device. TIPS FOR CLEANING: Use a gentle lens solution. To avoid scratches. Never wipe the lens when they're dry (there may be dust or particles). Use Soft materials such as cleaning cloths, Don't use paper towels or other rough materials.