I've got the IO7's as well. I have the Red Sensor lens that I use 99% of the time, works at night & low light days. Other lens is the Green Sol-x for sunny days & I believe I've used it twice only.
My perfect world would be the blackout frames (not the lens, just the black "SMITH" on black band - the "black" frame has white "SMITH" on a black band) with the Chromapop storm yellow flash (65% VLT) + Chromapop Everyday (25% VLT). Those two would do well as a night/really cloudy/snowy day (Yellow) and brighter/mixed sun/cloud days ("Everyday") set.
...unfortunately, Smith's own website doesn't let you mix n' match, which seems totally effed up to me. I'd pay $250 (list price) for what I've described above. Worse yet, it seems like you literally cannot get the yellow storm flash lens unless you buy it as a separate "replacement" lens (I can't find any combination sold that includes the yellow flash out of the box).
The best deal I can find now is:
https://www.sportchek.ca/product/332360186.html?gclid=EAIaIQobChMIs6b-6J612QIVSbjACh0VqA5MEAQYAiABEgKoIfD_BwE&gclsrc=aw.ds&dclid=CKSKlOqetdkCFVDdwAod6Y4Onw#332360186=332360188$199 for Chromapop Platinum (13% VLT) + Chromapop Storm (50% VLT). I can buy the clear for $60CAD (once it comes back in stock), though who knows what shipping will cost then
Definitely cheaper to just buy a pair of $40 Bolles for night skiing, but then you lose all the benefits of the spherical lens, superior venting, etc. of the I/O line.
https://www.sportchek.ca/categories/equipment/alpine-skiing/ski-goggles/product/bolle-freeze-black-ski-snowboard-goggles-with-clear-lens-201718-332361482.html#332361482=332361488My plan is to get those for $199 (less 10% for giving my e-mail). In terms of helmet, I researched the sh!t out of everything and settled on the Smith Vantage. I was going to get the Variance, but the BOA system on the Vantage is much better (pulls from all-around the helmet, rather than just the temples like on the Variance). My temptation is just to bite the bullet and pick up the Vantage MIPS from MEC at $300 (ouch) since I can't find the Vantage in Medium on sale anywhere. Might as well just get the MIPS for the extra $40 compared to getting the Vantage at $259 elsewhere (well, I could get 10% off at Sportchek...I suppose). I don't love that the Vantage this year comes in only the one colour, which includes the honeycomb pattern in green. A pure black helmet would be better, but meh.
I have IO7s and have frankly been quite disappointed in them. I get a deal through Smith so ordered them last year. The everyday lenses are good but the storm lens is awful. It fogs instantly and even worse, it then ices.
I suspect there's something wrong with that lens then. If one lens only is fogging up, then something's wrong with the specific lens (otherwise, the only difference between the two is the colour/tint). The I/O7's venting is top notch, especially if used with a good helmet. In fact, that's one of the biggest reasons why I want a new helmet - I don't have any "gaper gap", but I definitely do find that I can fog up my goggles if I look up with the goggles on (the heat from under my helmet fogs the goggles from the top).
Any way, I'd contact Smith --they have a lifetime warranty (assuming yours weren't damaged by your own abuse...):
https://www.smithoptics.com/ca/customerwarranty