Fitovers Eyewear, are the world's finest sunglasses specifically designed to be worn over prescription eyewear. The complete wrap around design is ideal for any outdoor activities, where annoying glare from the sun causes eye strain and discomfort. The Aviator Tortoiseshell style with Polarvue™ Amber lens blocks 99.9% of all reflected glare while allowing 16% of visible light to pass through the lens to your eye. Polarvue Amber lenses have a medium to dark brown/yellow tint that is ideal for bright sunny days and overcast conditions. The impact-resistant lenses meet ANSI-Z80.3 safety standards. [Fits over optical frames not exceeding: 148mm X 53mm or 5 7/8" x 2 1/16"] Please see the Fitovers size guide for all styles and fits.