B.D.
I agree with the others.
I have them on my eyeglasses. I LOVE it when I go outside, because they automatically darken.
They do NOT darken inside if you are looking out at the sun. This includes the car. So if you are in the car or in the house, and you still need sunglasses, the transition lenses won't help you.
That said, I will always get them on my glasses. I just know if I leave the house to drive, I put in my contacts.