It was work done at Microsoft Research (https://www.microsoft.com/en-us/research/wp-content/uploads/2016/02/tr-2001-119.pdf https://www.microsoft.com/en-us/rese

It was work done at Microsoft Research (https://www.microsoft.com/en-us/research/wp-content/uploads/2016/02/tr-2001-119.pdf https://www.microsoft.com/en-us/research/wp-content/uploads/...), but I don't think it was ever integrated into any products. Given our sensitivity to faces and eyes, I expect the result would be quite uncanny. Better to just side-step the problem by rendering sunglasses over the user's eyes.