The replacement lenses don't fit very well. They are too small. On the left and right side the lenses pop out while wearing. There is also a small gap left and right of the nose. The original lenses are also thicker. Because of this the lenses don't fit as stable as the original ones.

[old review... one star]
Not at all close to the Oakley lenses quality ..

[review update... 5 stars] July 28th, 2017

I first purchased the black polarized lenses and left a negative feedback because from my point of view, those lenses did not look to me as the same quality as the Oakley ones. I understand also that, the Oakley replacement lenses can be more expensive.
Then, I was contacted by Walleva and, they were so persistent and concern about my satisfaction with their products that, they offer to sent me free of charge the Polarized Fire Red Replacement Lenses (my choice) for my Oakley Dart Sunglasses. They also did not charge me for the delivery and I received the new red lenses in a couple of days after they said they were going to ship them. They look fantastic! I did not have any issues with the product, they fit perfect on my Oakley Dart frame.
Honestly, Walleva seems to really care about the customer's satisfaction. Finally, they really want you to let them know as soon as possible if you are happy or unhappy with their products. They are willing to work things out with you to make you feel and look happy with their lenses. I was contacted by Shelly and I was treated with respect and in a very professional way.
I honestly left one star review the first time. But after the whole painfulness experience, I really feel compelled to fix that and that's why on base on the overall experience I am leaving now 5 stars.

These do not fit the Oakley Dart sunglasses as they are way to small. Returned it weeks ago & still waiting for my refund.

I had a pair of Oakley Dart sunglasses that I had purchased a few years ago. Due to a lot of wear, the lenses became very scratched and I wanted to cry because they were my absolute favorite! Well, I found these replacement lenses and they are absolutely perfect!!! The fit was fantastic and I have no issues! I am so thrilled I can wear my favorite sunglasses again!!! I am actually purchasing a second pair of the replacement lenses in the event i need them in the future!

Fits well.