I have used high index lenses for years. I am very nearsighted with a lot of astigmatism. No one has ever told me what brand or type lens they sold me and they generally discouraged any questions. I have a terrible time finding frames that fit me, so get glasses made wherever I can find frames. That makes it nearly impossible to stay with one optician. Reading some posts, I am starting to think I should take an interest in the brand and type of high index lens given to me since some places make thinner lenses than others. How do I decide if what the optician wants to give me is good for me? Thanks.