These ES5 Safety Glasses by Crossfire feature an HD brown flash mirror lens with a 1.5 diopter bifocals. The HD lens filters blue light which can cause eye fatigue. Use in normal to bright outdoor use. Designed for outdoor sports, the ES5 safety glasses provides a polished style and is similar in design to Maui Jim. The sleek framework provides substantial coverage for a variety of environments. Meets the American National Standards Institute (ANSI) requirements, and is marked with the ANSI Z87 2010 markings.