Maximilian Pegasus (Pegasus J. Crawford in Japanese) had the Millennium Eye in his left eye at the start of the original Yu-Gi-Oh! series.
It was later removed by Bakura, and in later appearances like in Yu-Gi-Oh! GX, his left eye is always covered by his hair.
What did he do with his left eye? Did he use a glass eye? An eye patch? Leave the eye socket empty?
I'd prefer an answer from the anime, but am open to a manga answer as well.