OK, so I've got a helmet scratch in one of the lenses of my new Smith I/O's in a line of sight place. Is there a way to correct the scratch or is the lens toast ?
May it snow tonight where you are...
The (semi-) good news is that they are replaceable for as little as $25:
...they seem to scratch fairly easily, got one on mine the first time i used mine from a face plant in softish snow. Every so often the $55 i/o lens pop up on fleabay new for $20 - $30, i paid $25 for a sensor mirror which was new with the factory protective film. I'm now shopping around for a green sol-x.
I have many pairs of simiths too but i/o lens are very easy to scratch.
I have owned 4 pairs of I/O's and my girlfriend has I/Os. I contend that they are still more durable than one would think. You have to try real hard to mistreat your lenses. I regularly throw my helmet in the trunk with my gogg's still attached. I only get minor scratching that one woule expect from such bad treatment.
To the OP's question, I don't think there is much you can do about scratches in soft plastics like they use for ski goggle lenses. Maybe you could try some of that eyeglass scratch repair stuff, but I think it's designed for hard glass, not soft plastic.
I haven't noticed the I/O lenses being more prone to scratching than other goggles. I'm pretty sure it's almost exactly the same material and coatings as other high-end Smith goggles.
The one major scratch on my I/Os was from a pine branch. I don't necessarily think they scratch easier than anything else, but they'll scratch if you ski hard in 'em and/or aren't careful.
Have you tried skiing with them? I've had a pretty big scratch right in the eye line of my low-light lenses for about a year. It's a little annoying, but doesn't prohibit me from seeing. Try it, and if it's too bothersome, buy replacement lenses.
As others have stated - there's nothing for it but replacement. Dielectric mirrors such as Smith uses on many of their goggles (not just the I/O line) are easy to produce, relatively inexpensive, and also have a fair amount if durability built in - given what they are. A mirror on a lens is in essence ultra thin layers of vaporized metal deposited and bonded to the substrate surface. They're very thin, and will show abuse, scratches etc over time.
The I/O lens line retails in the $55 dollar range for most mirrored replacements. And you can sometimes find discounts in your local shops or perhaps online.