Shield your eyes with the Oakley Bottlecap Sunglasses Activated by Transitions. Oakley partnered with Transitions Optical to create sunglass lenses that ultraviolet rays trigger to darken or lighten. As you sit at a caf in bright morning sun, the lenses darken to let less light reach your eyes. When you walk your dog in overcast conditions, the lenses get lighter. The Bottlecaps feature an open-edge frame design so you have unhindered downward views. The lenses wrap around to fully protect your eyes and provide a shaded peripheral view.