Oakley HSTN RX OX8139 frames combine Oakley performance with a round, prescription-ready design. The olive-green, matte finish makes them suitable for everyday wear and clear-vision prescriptions. Key attributes: Green | O_Matter | Prescription-ready | Demo lenses | Full-rim frame | Temple length 140 mm | Round frame | Matte finish | HSTN RX styling | Dimensions & fit: Lens width: 50 mm | Bridge: 21 mm | Temple length: 140 mm | Lens height: 46 mm | Recommended for oval, heart and square face shapes