Why Category 4 Lenses are Mandatory on Your Expedition
At the Mount Everest summit, the UV radiation is 100% stronger than at sea level. Without the right physics in your eyewear, the sun will burn your retinas, ending your Mount Everest expedition instantly.
Standard sunglasses have a VLT of 20%. For the Mount Everest summit push, you need 'Category 4' lenses with a VLT of 5%. This level of darkness is essential for surviving the glare of the expedition.
Polarized lenses block horizontal light waves reflecting off the Khumbu Glacier. This allows Everest trekking groups to see the actual texture of the ice, helping to spot hidden crevasses during their expedition.
Light doesn't just come from the front; it reflects up from the snow. Glacier glasses must have side shields to prevent 'leakage' of UV rays that can cause snow blindness on the way to the Mount Everest summit.
You cannot climb what you cannot see. Invest in the best optics for your Mount Everest expedition to ensure you reach the Mount Everest summit safely.
