I have 2 questions:
1. Are 1.67-index lenses any worse than CR-39 in working with Transitions (gray color) photochromic tint? Or does 1.67 plastic darken as well as CR-39?
2. Does the addition of premium AR coatings (like Crizal or Vivix) diminish the darkening ability of Transitions photochromic lenses on 1.67 plastic or CR-39?
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