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I have one with blue eyes

From what Ive seen, golden eyes are fairly common in the "marasso" clade (just as in bosniensis), at least compared to the northern clade:
Vipera berus by Lennart Schmid, auf Flickr

But heres two weirdos I have seen in Germany, completely black and grey eyes:
Vipera berus by Lennart Schmid, auf Flickr

Vipera berus by Lennart Schmid, auf Flickr