Something black, something light, different.
This is the new Acuvue Oasys with Transitions. I tried them out on a run...not quite as dark as sunglasses, but visually amazing on a sunny day. The company says they improve contrast sensitivity, block UV, and block harmful blue light. Going indoors from the sun, they lightened back up within a minute or two. To be sure, I wear sunglasses to protect my eyes and eyelids from flying debris and from sunlight, so these are not a one-to-one substitute, but they are a great option for the right person and the right activity.