UV Protected Lenses BS EN ISO 12312-1:2013 Filter Category 3 (Bright Sunlight) Spring Hinges for Comfort and Durability High Impact Resistant Polycarbonate Frame Moulded nose piece Impact and Scratch-resistant acrylic lenses Available in +1.0 to +4.0 strengths in .25 increments Available in Black and Tortoiseshell (see other listings for Black) Unisex Tested to BS EN 14139:2010 Measurements for this frame in the pictures section Independently tested to conform to current directives