While I love the concept of this product, I'm glad I held off until now to review it. I have owned my Thinoptics for less than 6 weeks. I attached them to my phone, but the sticky tab has detached from the phone making the item ALOT less beneficial than when it adheres to my phone. Now I keep the Thinoptics in a pocket in my purse.....right where I also keep my reading glasses.....so the value is seriously diminished when not attached to my phone. And on top of it, the sticky gluey residue from the adherant is left on my phone case, attracting lint from my purse to cling to it.