Yellow Lens & Coppers Lens for sharper contrast and comfortable viewing in the nightlight condition and daylight condition respectively. Protect your eyes from the sun and your work with this Bifocal Safety Reader. They have a shatter-proof polycarbonate design that meets ANSI Z87.1 requirements for eye protection. Rubberized nose pieces ensure a comfortable fit, while the tinted lenses have magnified portions at the bottom of each. You must be amazed by the High Quality, Finest materials, Fitting, Templates and the Low Price. We offers a 30 day money back guarantee on all purchases. Simply return the purchased item within 30 days for a full refund. We are sure you would not want to return this product, but just in case we have our 30 day money back. Customer Satisfaction is our Mission,.