Optic Nerve Halogyn Photomatic Sunglasses polycarbonate lens 2.5" high 3" wide Photomatic technology provides a single lens performance solution as it automatically adjusts to changing light conditions in 7 to 10 seconds. 100% UV Protection to protect your eyes from harmful UV light. Active Lens Venting to increase air flow and eliminate fogging Adjustable bridge rest for custom fit and secure performance Limited Lifetime Warranty