The founders of the use of sunglasses in tourism are participants in the first polar expeditions and mountaineering. Brave travelers improved their sunglasses empirically: borrowing something from the inhabitants of the Arctic regions, inventing something on their own. So there were special sunglasses for climbers and tourists who became a mandatory part of equipment for winter and summer hiking and climbing.
Currently, their most diverse models are on sale, both in terms of using various technologies and in terms of design. How to choose the right sunglasses? We will try to help you with this.
Mountaineering Sunglasses: How Does It Work?
Climbing glasses should, first of all, meet two requirements: be reliable eye protection from ultraviolet radiation and from bright light. But polarization, light weight, original design – these modern “chips” are not their most important and necessary advantages.
UV is rays in the wavelength range from 380 nanometers and below. Please note that on decent, not necessarily expensive, models of sunglasses for mountaineering, there is always a special marking indicating the degree of protection against ultraviolet radiation.
The UV-380 badge or, more often, UV-400 (apparently with a margin) says that the glasses will protect you from evil UV rays by almost 100%.
The brightness of sunlight (do not confuse with UV rays) – it is “opposed” by sunglasses of 4 classes. The “tourist” class includes the 3rd protection class. Protection classes from brightness of sunlight: how to choose sunglasses for hiking trips
1 class. Delays sunlight from 20% to 75%. It is used in protective (construction) glasses, glasses for drivers, and where strong blackout is not required.
2nd grade. From 57% to 88%. Wide functional purpose: both beach-city and sports, for example, yellow and generally all glasses with medium dimming.
3rd grade. 88% to 92% with strong dimming. This is our “tourist” class – sunglasses for mountains, water, snow.
4th grade. From 92% to 97%. Specialized for military (pilots), gas welders, metallurgists, scientists (sun observation, etc.)
The brightness protection class is indicated either in the instructions for the glasses or is not indicated at all, but is determined “by eye”.
Equally important is the tightness of the rim to the face. If the glasses sit freely, they will not be able to fully protect against UV radiation and from light. Useful “bells and whistles” – soft lining on the frame and blinkers, which also protect against wind.