As noted earlier, this is at least my 3rd set of RX inserts. I've been very happy with them. The whole unit is very light but accomodates my variable focus bifocals well. Thanks for a great product
Pros: Very easy to insert behind the normal lenses - or to remove. If you mess up the frame, you don't need new lenses - if your RX changes, you don't need a new frame
Cons: Haven't really found a con - 3rd set
This review was written in the old system and had content requirements that are different than reviews written today.