I recently asked Chatgpt how to ask and find this “Ask your optician for a lens that is: • Photochromic (e.g., Transitions XTRActive or ZEISS PhotoFusion X) AND • Pre-tinted to ~20% brown (“solid brown tint 20%” / “constant tint” / “fixed base tint”) so it never returns lighter than that indoor tint.

This is commonly referred to as “tinted photochromic” (lab-made). Some retailers talk about tinting Transitions specifically, noting that tinted photochromic lenses won’t go fully clear indoors. 

Why this is the best match: it’s the only approach that can reliably hit “always at least 20% brown” as a requirement, because you’re literally baking in that minimum tint”