See the details safely. COAST SGL400 Bifocal Replacement Lenses enhance COAST safety glasses with 1.5, 2.0, and 2.5 bifocal magnification for better sight—to individualize eye protection and boost work performance. Constructed of impact-resistant clear polycarbonate, these durable lenses feature premium anti-fog and anti-scratch coatings and guard your eyes against harmful UVA and UVB rays. SGL400 Lenses are compatible with all three models of COAST safety glasses (SPG300, SPG400, and SPG500) and are backed by COAST’s one-year warranty against defects in materials and workmanship.