Really keep the sun out while keeping glasses clear for vision purposes.
Not only do I luv my new glasses, adding the anti-reflective coating was a game changer. Being that I use my computer every day this coating allows the glare from the screen to effect my view. Even when driving at night, the coating helps to prevent the glare from all the lights to impair my driving. I would never add this to my glasses because of the extra cost, but now that I see the difference I wont get glasses without it.