I was upset with this at first...then I looked more carefully at the instructions. Yes, instructions come in handy sometimes :D I had put it in upside down so it was blocking my view when the visor was in use, so once we got it the right way, no more blocking my vision and it works great! I wear perscription glasses so sunglasses for me are not something I wear much. This allows me to be able to reduce some of the glare on a bright sunny day, which I love. I also like the fact that it dims the glare of oncoming traffic lights when driving at night. It helps also, when someone leaves their high beams on to not blind you as much. #RankBoosterReview