Locs, my husband prefers these over other standard brands. However he really prefers his Zenni sunglasses, and some polarized lenses over other lenses as well.

I can't answer your question directly, but I can tell you I have a pair of sunglasses that wasn't supposed to be possible. I insisted on my specific requirements, I was repeatedly told they could only do 2 out out the 3 total specific requirements. I told them to call whoever they needed to call and lo and behold, they did it!

The takeaway is that you can talk to a human you can get a custom order for pretty much whatever you need. You can even buy a pair of regular sunglasses and have them switch the lenses for a custom order.

Noir sell fitovers that can go as low as 1%.

https://www.maxiaids.com/noir-medium-fitover-with-uv-infrared-1-percent-dark-grey-green

However, 1% is very dark, and they do have other strengths. One thing I would warn, sometimes their build quality isn't the best. I have many clients who like them, but the pair I had broke in less than 2 weeks.

I just ordered a pair of Julbo Explorer 2 (Spectron lenses). It looks like they have a VLT of 5%. Still searching though, if others have ideas.

Update: I think Amazon may have the VLT wrong on these.

Update 2: these are slightly darker than my Smith sunglasses that have a VLT of nine or 10%. The brown lenses to help improve contrast but or not much darker than the Smith sunglasses.