This is my 3rd PTX
"This is my 3rd PTX insert. 1 from the older version, 1 for the new version along with the total set of shields and earpieces of the Sabers and now I ordered this one because of an Rx change and I didn't want to have to be without my glasses while the RX was being done. I like these glasses. The clip in goes in easily and snaps into place with just a little minor tilt adjustment usually. There is no nose piece on these, it is on the Saber itself so no readjusting when changing from one pair to another. I use this insert mostly for my sunglasses (grey shield), shooting (yellow or whatever is best for the weather), and clear for my woodworking and anything that requires safety glasses. My optometry place does the Rx and I have my progressive lens put into it so I can see up close and farther away. I do like that I can remove the PTX and just use my safety glasses since my up close vision is not that bad. The Sabers and PTX have been a great choice for me"