CrossFire Crossfire Safety Glasses Es5 1.5 Diopter Brown Frame Brown Mirror Lens 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