I've used them through out the day, to see how the shadowing darkness / protection works. excellent direct sun blockage ! eyes could totally relax. vision light stays stable throughout the day/ light changes. still great on the cloudy days and pulls up the shadows enhancing your depth perception and eliminating flatness. Great fit ! NO SLIPAGE !! which is great for I have a small face & hate a lens that moves or slips. I like the look, so I don't know why everyone is such a princess about it anyways, for I think performance quality outweighs fashion any day ! & I'm a girl !