These easy to use, Blue Light Blocking Clip On Computer Glasses are a must-have for everyone who spends most of their time in front of the screen. Attach these on your regular prescription or reading glasses with extreme ease and bid farewell to eye strains and headaches. Why You'll Love It Blocks blue light & UV: The anti-reflective coating on these clips are efficient in blocking blue light from the computer or cell phone screen. These also provide protection against UV rays. Convenient use: With 180 degrees rotating design, these can be conveniently pulled up or down for repeated use. The detachable clip makes these easy to use with prescription glasses. Get better sleep: With no eye strain and headaches, these anti-blue light clip-on computer glasses are sure to provide you the ease and comfort of a good night's sleep. Money-saving gadget: Buying this useful gadget is much cheaper than eating expensive medicines for headaches or eye strain. Put an end to your increasing eyesight number with this anti-glare frame. Lightweight and compact design: These blue light-blocking clip-ons are lightweight which makes them comfortable to wear. There will be no damage to your existing prescription lens. Features Material: TPU polyurethane Lens thickness: 1-2mm approx. 180° pull up and down design Wear on your existing prescription glasses Blocks blue light and UV Prevents from eye strain and headaches Clip-on design for easy installing and removing