If you are replacing a scratched lens and do not want to think about it, this is the tint to take. Black over a neutral gray leaves every color where it was - a red brake light stays the red it is - and twelve percent is the transmission a bright road wants without going dark at dusk. It is also the widest-cut tint in the catalog: it reaches every one of the ten makes on the site, which no other color does.
The pairing that does the most work on water: a warm rose base to pull contrast out of a dark bottom, and a cold blue mirror on the front to take the top off the glare bouncing back at you. Ten percent through means it holds up at noon in July, and the largest single group of frames it is cut for is Costa - which is where most of it ends up.
Bronze underneath, green mirror on top, twelve percent through. Bronze is the tint that pulls a tarpon off a sand flat and a fairway apart from the rough, and the green mirror over it keeps the whole thing from going orange the way a bare bronze lens can. Half of every emerald lens in the catalog is cut for a Costa frame, which tells you where it is used.
A driving lens is a narrow specification and this page is what meets it. Gray or neutral underneath, so a brake light stays red and a green signal stays green; eleven or twelve percent through, which is the brightest this catalog goes; and a polarizing filter to take the sheet of glare off a wet road and off your own bonnet. The American standard for sunglass lenses tests the first of those specifically, and it is the reason a bronze or a violet lens is the wrong tool in a car.
Fishing is the job a polarizing filter was made for, and the Academy of Ophthalmology names it first when it explains what one does: the filter blocks the light bounced off the surface and passes the light coming straight at your eye, so the water stops being a mirror and starts being water. Tint does the rest. Every lens on this page has a warm base - rose-warmed gray or bronze - and warmth is what pulls a dark fish out of a dark bottom.
Each of those is a real slice of the shelves rather than a landing page: the frames behind it, the light each lens passes, and what the people at Ikon would take it out in.