Ultraviolet Radiation (UVR)
Good quality sunglasses eliminate solar ultraviolet radiation (UVR), in particular the more damaging UVB radiation. UV rays from sunlight can damage the retina and the lens of the eye. Too much exposure is linked to conditions like canver of the eyelids, cataracts and age-related macular degeneration. For sunglasses to provide maximum UVR protection they need to meet the optical industry standard UV400 rating and all Evolution sunglasses and eyewear meet this standard. They will, therefore, provide the eye with substantial protection against solar UVR and reducing the amount of UVR that the eye is exposed to over a person's lifetime will be beneficial.
Polarised (Polarized) Sunglasses
Polarised (polarized) lenses are different to standard sunglass lenses; they have a special film either sandwiched between two other layers of the lens or applied to the front of a base lens. What this special film does is eliminate glare off a surface like a pavement, road, water or snow. Lightwaves from the sun travel in all directions but when sunlight strikes a surface, it becomes concentrated – this polarised light as it is called causes glare. A polarised lens will eliminate this polarised light. The result is the ability to see light in its pure state. Objects will appear more defined, sharper and naturally coloured. Instead of squinting to minimise glare, a polarised lens will allow your eyes to see colours with true clarity. Because polarised lenses block glare reflected off a surface (road, pavement, water or snow) they are popular with sailing, boating and watersports enthusiasts, fishing enthusiasts, snow sports enthusiasts, runners, cyclists and drivers. When used for fishing a polarised lens means you will be able to see down below the surface of the water.
Polycarbonate is the material favoured by most sports eyewear brands like Evolution because this material is very light but shatterproof and impact resistant; providing a very high degree of eye protection. Unlike glass however, polycarbonate will easily scratch so you do need to take care of the lenses and always keep your sunglasses or eyewear in a case or carry pouch when not in use (all Evolution models are supplied with a carry pouch and many with a hard case too).
Lenses colours and their uses
Multi Lens Interchangeable Eyewear Sets
These have become very popular because they give a choice of lenses fitting the same frame. They will typically come with at least 3 different lenses such as grey, yellow and orange. It means you can change the lens colour to suit the light and background conditions.