Wore my Rudy Projects for the first time today all the glasses you will ever need, photochromic lenses, we had it all today lots of dark cload and a bit of sunshine, walked into the cafe and forgot i had them on.
Yup, the sign of a decent pair of photochromics.
My Optilabs pair you don't even notice the change and I get surprised at how dark the lenses look sometimes in sunny weather as you sure don't notice it.