I could not sort this out because, for example, in the Frogskin model, the black iridium polarized looks lighter compared to standard black iridium (see the below links)
Oakley Covert Frogskins | Official Oakley Store
Oakley Polarized Frogskins | Official Oakley Store
Whereas in the Chainlink model, there are two standard black iridium variations and one polarized black iridium where one of the former looks exactly the same as the polarized, but the other has a different shade.
Oakley Chainlink | Official Oakley Store
Oakley Chainlink (Asia Fit) | Official Oakley Store
Oakley Polarized Chainlink | Official Oakley Store
Oakley Covert Frogskins | Official Oakley Store
Oakley Polarized Frogskins | Official Oakley Store
Whereas in the Chainlink model, there are two standard black iridium variations and one polarized black iridium where one of the former looks exactly the same as the polarized, but the other has a different shade.
Oakley Chainlink | Official Oakley Store
Oakley Chainlink (Asia Fit) | Official Oakley Store
Oakley Polarized Chainlink | Official Oakley Store