-- in any case It was certainly in practice in England during the 1400s, during which the Wars of the Roses Occurred... and are what GRRM borrowed elements from for the Books
aside from the Greek origins, one use of coins over the eyes would also be to weigh down the eyelids, preventing them from opening due to the effects of decomposition
as to why he Modified this to stones with Eyes painted on them, that would be his reasoning, and he likely does explain the practice in the books
I believe it's because they consider it bad luck to look into the eyes of a dead person, so the stones are used as a mask. There's very little mention of it in the books and even less in the show though, it's just a funeral tradition every culture has them and they're not always rational or explainable.
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It's traditional for some of the religions in Westeros..
Does anyone know why...on the Game of Thrones they put what appears to be rocks over a dead persons eyes? And the rocks usually have eyes drawn on them. I tried to google it and found nothing.
