1. Vintage Style – Big round style, metal frame, anti-blue light lenses, spring hinge and solid screw hinge all these details make glasses become durable enough for long time using and ensure you a perfect performance. 2. Protect your eyes - Blue Light Blocking Glasses can effectively block harmful UV rays and relieve our eye fatigue protect your eyes from harmful blue light when you watch TV, look at computer, tablet, smartphone or other electronic devices. 3. Anti-blue light Lens - It can filter 90% blue rays, reduce eyestrain, prevent eye dry, minimize headache and make you sleep better. 4. Spring hinge - comfortable to wear and skin fridendly, avoid clipping face and hair, fits different face shapes.