User blog comment:Dryuuu/Mordred questions in Series 5/@comment-3325613-20120428124026/@comment-3325613-20120428140546

@GwaineLooksLikeCenred, yes, if you want to give it an in-Merlin universe explanation, surely Nimueh worked magic on herself to look younger and that could effect her eyes' colour. As for Dryuuu's question, I remember a scene in S3Ep8 in which Gwen told Gaius that she had seen Morgana casting a spell: she said that "Morgana's eyes... it was like they were on fire" so I guess it is very intimidating, but I don't know if sorcerers feel or know when their eyes change colour. Surely, apart from that, it'd be cool to have magic anyway! XD