Vision replacement lens — optically correct polycarbonate construction delivers crisp optics and impact resistance. Integrated tear-off posts accept up to 28 stacked tear-offs for quick track-side maintenance. An anti-fog inner coating helps eliminate condensation, while a durable hard-coat on the outer surface improves scratch and abrasion resistance. The seven key-hole locking system ensures a secure, precise fit with Vision frames for consistent, worry-free performance.