We're sorry for the inconvenience!
There is a trick - the photochromic properties sometimes need to be activated. If you place them in the freezer for about 10-15 min then take them outside into direct sunlight, you will see the color change. If you don't, then they are defective and we can ship you a new set.
Keep in mind, our photochromic lenses do not get as dark as our standard grey lenses.
In addition, they are activated only by UV light, so they won't work as well behind UV protected materials, such as your car windshield or some windows.
The weather can also affect your photochromic lenses. In the cold, photochromic lenses get darker, but take a while to activate. In the heat it's the opposite - they change quick, but often don't get as dark as they would in colder weather.
Remember - each purchase includes a 60-day guarantee! If you encounter any issues upon receiving your lenses, just let us know!