Colin Lee Opticians - Transitions XTRActive lenses go darker than any other photochromic lens, even behind a car windshield. Available in 3 iconic colours, Transitions XTRActive can help to deliver optimal visual
Photochromic Lenses: Transitions and Other Light-adaptive Lenses
Transition Brown vs Grey - Photocromic Lenses - Rx-Safety
Glasses Direct ™ - Transitions® Light Intelligent Lenses™