The yellow Aegis Arc/Echo Replacement Lenses from Smith Optics offers ballistic protection for your eyes when attached to Smith Optics Aegis Arc or Aegis Echo frames. They are offered here as spare or replacement lenses. These Aegis Arc/Echo lenses feature high quality optics designed to provide a distortion-free, wide field of view using Tapered Lens Technology (TLT), anti-fog and scratch resistant lens coatings, and 100% protection from UVA/UVB rays. The yellow lens provides 85% visible light transmission. The Aegis Arc/Echo Lens meets MIL-STD 31013, ANSI Z87.1, and EN 166 standards.