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Unlike most cycling glasses Assos glasses are neither polarized or photochromic. Instead they use a technology called Tunnel Vision. Tunnel Vision is an ASSOS innovation produced by Carl Zeiss Vision Sunlens.
When a cyclist enters a tunnel and or shadow environment you shouldn't have to worry that your world will go dark. With Tunnel Vision, the lower third of the lens is clear, followed by a sharp change to reduced light transmission in the upper two-thirds of the lens. Just by slightly lifting your head you can enjoy a clear yet still-protected view ahead. This allows you to keep your eyewear in its place and your hands on the bars. Simple, functional and safe, try a pair today and see what everyone is raving about!