Black Forever 623 Progressive Eyeglasses - Shiny Black Frames-Silver Trim BK623 feature lenses made to your exact prescription, with two vision fields that blend seamlessly for a great look. Black Forever 623 Line-Free Progressive Bifocal Eyeglasses will have you styled up - whether you're cruising, chilling, or sock hopping. Thinner frames and thicker temples let these line-free bifocals make a strong impression, and a metal accent band completes the picture.. The frames of these Progressive Bifocals are hand-crafted in Japan, and made with the finest acetate for a durable, lightweight piece that's easy and comfortable to wear. If you're looking for a retro vibe with modern flavor, choose Black Forever - it's always in style.