"Cocked an eye" at someone is a set phrase meaning looked or glanced at them inquiringly, critically, etc. In this case the author is mentioning at the same time that the colour of his eyes is "mild blue".
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GPYIn this case the author is mentioning at the same time that the colour of his eyes is "mild blue".Actually, it occurred to me later that "mild" may mean that his look is not severe, rather than modifying "blue". I think you can read it either way.
fivejedjon GPYsite does not let me type c-o-c-k.Mrs Grundy strikes again.Logic problem: How do you say that a thing cannot be mentioned if you have to mention it to say so?