I want to address polarization relative to visual performance in your chosen sport. There is lot of misinformation regarding lens polarization and hopefully after reading you will have a better understanding enabling you to make a more informed decision when purchasing sunglasses.
Some sunglass companies are making, or have made, the statement that their lenses have 100% polarization. If they are referring to their lenses having the most polarization possible for a given tint, then their statement is misleading but true. The simple fact is that 100% is simply not attainable in today’s technology. Simply put, the darker the lens tint, and by that, I mean the lower the light transmission, the greater the polarizing efficiency or percentage polarization.
Another misunderstanding is the quality of polarization in photochromic lenses. In the USA a lens has to have 50% polarization to be called polarized. I have tested lenses that have slightly over 50% polarization and that small amount of polarization is not useful. Photochromic polarized lenses, lenses that darken with the level of light intensity, have polarization that is linked to the tint at its lightest or highest light transmission level. The lenses will darken as the exposure to UV light intensifies but the polarization does not increase at all. These lenses do not work well to reduce horizontal surface glare. As a matter of fact, the polarization properties of this group of lenses is barely noticeable.
It is true that performance in many sports, and fishing is a great example, can be improved by a lens that has both darker and lighter tint properties. This is the reason Solar Bat developed the double gradient polarized lens tints and was awarded a USA patent. Solar Bat’s double gradient tints afford a darker tint gradually transitioning into a lighter tint and both tints have maximum levels of polarization. With a tilt of the head the wearer can adjust to varying levels of light intensity IMMEDIATELY.