The Fortis tortoiseshell AV's with a graduated brown lens are a modern twist on the classic aviator sunglasses. Fortis Eyewear are specialists in producing fishing sunglasses that help you see deeper into the water to locate your quarry, and help reduce eye strain at the same time.The polarised lens help eliminate glare and maintain a high visual clarity and are manufactured, and tested, to British Standard BS EN ISO 12312-1:2015.