Squash and socalmad, do you guys really not know how to read the information in front of you?
It's been posted several times in this thread, and just on the previous page. Please endeavour to use some common sense. I don't really want to clutter this thread repeating the same thing over and over again.
BigTarget, in order to get such high quality lense optical properties you have to follow some very precise geometry. The area in front of your eyes has almost 0 optical imbalance and 0 prysmatic imbalance. Unfortunately if we continued this geometry into the peripheray vision area the lens would be too thin. That line denotes the edge of the peripherary vision area. It is impossible to see that area with both eyes when the goggle is on your face so the optical properties in that area are not as important. That area is also just for peripherary vision.
When you wear the goggles and actually play it's hard to notice that line because it is so far around in your vision. Some people's eyes can't even see it when it's on their heads because of how far around it is. But your eyes can still catch movement in the extreme peripherary area behind that line. We could have stopped the lens at that point, but I wanted that ability to catch as much movement out of the corner of your eye as possible. The line was a compromise to have the best optical properties to the main area of the lense, and the most extreme range of side vision.
Wrap around lenses from other companies
that do not follow such high optical quality concerns just polish it in... but then the ones we have tested that do that are NOT good for your eyes... and it brings down the optical properties significantly... sometimes even to the point of failing the ASTM!
That line also denotes a sensible level to put stickers up to if you like to sticker your goggles.