Read the specific product sheet
Transitions lists GEN S and XTRActive as distinct products. XTRActive is positioned for extra darkness and activation in the car. Do not assume every photochromic lens behaves the same way behind a windscreen.
Ask about everyday compromises
Compare indoor appearance, available colours and driving suitability in the local product documentation. Ask about a separate sun pair for your routine; a daytime tint is not a treatment for poor night vision.
Sources & verification
Sources checked: