I have been a customer for over 10 years. I recently purchased my 5 th pair that did not work. No mention on their website on how to return and no replies after 3 emails. Another company that doesn’t seem to care. Beware. Don’t buy Ok so they redeemed themselves, they apologized profusely and worked with me over the weekend to exchange the glasses. Now on my 5th pair that is coming soon and great service although delayed a couple of days