1. A series of frames can be purchased with BOGO coupon. 2. Add at least 2 pairs of glasses(whatever gender,whatever color,whatever shape) to your shopping cart enjoy 50% off. 3. Single vision 1.50/1.57 index lenses are free for you. 4. Upgraded lenses are available at an extra fee. 5. Shipping, tint, clip-on are not covered. 6. 14-Day 100% Money-Back Guarantee & 90-Day Warranty.