transition lenses?

[rimless frames]

We have picked out the glasses we like and will be ordering glasses online. We want transition lenses that will darken when exposed to bright sunlight. But we couldn't find a button to specify this. Which store carry the best transition lenses?

[prescription eyeglasses]

We use the term Photochromic lenses instead of transition lenses. We have Lens Package BP (Thin and Lite (1.57) Photochromic Len) for $59.95 more and Lens Package MP (Thin and Lite (1.57) Progressive Photochromic Lenses) for $89.95 more.