Yes, dark goggles in sun, light in cloudy conditions. I usually wear sweedes for training, but don't like them for racing because if you get kicked in the face they can cut you. For racing I like the goggle speedo makes that have a similar profile to sweedes but have a little bit of padding.

I generally only wear my prescription goggles for races becase they cost twice as much as the non-prescription ones. After swimming in some bright sunshine one race last summer, I got a pair of prescription goggles whose lenses are darker to go with the set that have clear ones. Other than that, I think that if you find a brand and model of goggles that fit you well, then buy a couple pairs and wear them all of the time.

I vary by light conditions, (swedes in metallic/UV protection for bright, light smoke color for dark mornings) but not by distance.

Do you wear swedes for IM. I haven't done my first IM yet, just planning it out, and sometimes the swedes even fall out when I do a fast rollover in the pool, I can imagine with all the kicking and turbulence and stuff...

I don't do IMs, but they work out fine for me for ocean 1/2 IMs, and some open water races that would have scared off any non-fish triathlete.

But then I'm good at using my elbows to make space for me in crowded situations.