Sunglasses are available with many different lens technologies, that can help maximise what you do. We have put together a short summary to help you gain a better understanding of the difference between these three types of lenses.
To understand how polarised lenses work, it’s helpful to understand a little bit about how light works. When light is reflected from a smooth surface, it's horizontally polarised. The horizontally polarised light decreases visibility and creates glare. Polarised lenses work to combat this glare by blocking horizontal polarised light. The result is a reduction in annoying, and potentially harmful glare. Polarised lenses are ideal for driving, water sports (sailing and fishing in particular) and winter sports, whenever the eyes are under constant stress from the sunlight reflected by flat surfaces (water, snow and ice). You also have the pleasure of better vision under all circumstances, with colours appearing more vibrant than with normal sunglass lenses.
Gradient lens tints for sunglasses are popular for both fashion and function. These popular lenses feature a fading tint, and are dark at the top fading to a lighter shade at the bottom. Graduated tints are good for driving as the bottom of the lens is lighter which makes it easier to see controls within the car. Gradient lenses are ideal for indoor to outdoor situations, if you are popping in and out of stores in an open air mall, for example. You could keep your sunglasses on throughout, utilising the lower part of the lens while you shop and the upper part when you head outside.
Photochromic lenses are lenses that darken on exposure to UV radiation. Once the UV is removed (for example by walking indoors), the lenses will gradually return to their clear state which are almost as clear as standard plastic when deactivated.