Try on the Gannet GNT 120 OCP at your local The EyeDoctors Optometrists location. These tortoise designer sunglasses from Costa Sun are perfect for enjoying time outdoors and catching some sun. Made from plastic, these sunglasses feature a design and can help you see clearly with prescription lenses. At The EyeDoctors Optometrists, we can build a complete pair of Costa Sun Gannet GNT 120 OCP just for you, with custom lenses designed for your vision needs.