Here is a smart pair of sunglasses that combines with your smartphone for easy tint control. The Ampere Dusk features open ear audio. It has polarized, UV blocking lenses. These glasses have a button on the frame that let you adjust the tint. They last up to 7 days for tint change and 4 hours when playing audio.
The Ampere Dusk Sunglasses come with tint adjustment in 0.1sec. They weigh less than 1oz. You can find out more about it here.