I wear them outdoors whether it's sunny or overcast. Also, when driving. I also wear them indoors at home when I need them, which is usually when I'm trying to focus on the TV or laptop but can also be when I'm feeling overwhelmed and seem more sensitive to everything as a result.
I don't wear them indoors in public, but anywhere else I'm happy to.
When I discovered that I was autistic, before my diagnosis, I started wearing them. Until then, I hadn't realised that my light sensitivity was different to anyone else's, and hadn't even realised that it was the reason for so many of my struggles. Once I tried them out whilst watching TV and using my computer, I discovered what I'd been missing and how much easier they made things.
They've made it easier to do my work, without my head feeling frazzled. I can now watch multiple TV episodes back-to-back, where I used to have to stop after one. Driving is easier. Just going out for walks is easier.
I wouldn't have worn them outdoors on overcast days before my diagnosis, just because I know it looks a bit weird. Now, I'm happy to because I have my diagnosis and it's given me the confidence to do what I need to do regardless of the reaction of others. The same with all of the accommodations I now allow myself. They make me stand out, but I know that I have a genuine reason for them and I'm not just being odd.
I had laser eye surgery 5 years ago. My prescription wasn't terrible, but I struggled a lot with my vision and I paid a fortune to get it fixed. It was fantastic, but I quickly discovered that it didn't stop all of my issues with focusing, even though I could see so much more clearly. After realising I was autistic, I realised why the laser eye surgery hadn't quite been the miracle cure I'd dreamed of. My sight's actually deteriorated again since, and I may just tip over the line into needing glasses again this year. If I do, I'm making a point of getting prescription glasses with a tint.