In theory, having the ability to change lenses while you're on the hill sounds nice, however realistically speaking, that's much more difficult to do when you've got any variation on the theme of snow whirling around you or children zooming by you. Case in point, the folks over at Julbo understand this predicament, and created the Women's Elara Goggles, which feature a Zebra Photochromic to adjust with the changing conditions rather than forcing you to swap out your lens halfway down the hill.
Furthemore, the Elara is constructed with a minimalist frame and is reinforced with a siliconized strap that makes the helmet-to-goggle ratio seamless. Additionally, the Elara is outfitted with an anti-fog lens, which means when you're bootpacking up a hill and breathing heavier than a troll chasing after a group of children through a castle, your lenses won't be affected. Not only that, but the strategically placed vents dump excess heat, so your face doesn't feel akin to the Florida Everglades.
Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.