I have a rather strong prescription to my glasses, so getting "actual" sunglasses costs several hundred dollars. I do have transition lenses, but they don't work in the car. I decided to give these a try and am very pleased with them! They fit securely over my glasses, and are pretty light so they are comfortable. The nose piece is a bit wide, so I feel that on my nose which sometimes makes me think these glasses are sliding down when they are not. They have thick side pieces, but there is a little window in each side for your peripheral vision. This window (so far) doesn't quite help me while driving, and I must still turn my head and look over the side piece in order to check for cars to safely change lanes. I don't know yet if that will be a permanent "problem" or I just don't have the hang of it yet. Overall, I am very pleased with these glasses! They work well, are stylish, and saved me hundreds of dollars from additional prescription sunglasses. I have noticed also that the brown lenses make things sharper. I'm not sure about the polarizing lenses, but they do significantly reduce glare. They work well with bright sun, yet are not too dark so they can be used during "in between" weather where it's not blindingly sunny, but not cloudy either.