Okay, I just discovered these online and I love them in Gold. Then I saw the 'Landscape' version which I see only come in Silver. What is the difference in the regular and the Landscape? Are the Gold dark enough to give good protection? And I see it says they come in PM, MM and GM, but it doesn't show the different sizes. I'm 3 hrs. from a boutique so any help and advice would be appreciated. BTW, I'm used to Maui Jim's, good protection and polarized. Thanks!