FYI the higher the index, typically the worse the abbe value and hence chromatic abrasion is. I never pay extra for thin & light lenses because of that and alwa

FYI the higher the index, typically the worse the abbe value and hence chromatic abrasion is. I never pay extra for thin & light lenses because of that and always stick to standard CR39 lenses. My myopia is only -3.5 though, so the difference between 1.5 and 1.67 index is negligible as the frames are thicker.