How would a literal eye on the back of the head work?

So I've got a fantasy race of people with four arms. Their second pair is able to reach behind them like how our arms are able to reach in front of us, and so could work with things behind their backs just as well as in front (I've already got their arm anatomy worked out). The only problem is, they'd need to be able to see what they're doing behind their backs, so I thought of giving them a third (and possibly fourth) eye(s) on the back of their head. The extra eye(s) would be independent from their front eyes. I'm not sure though how this would work anatomically though. I'm also not sure how the new eye additions would affect their vision, both overall and with specific regard to focusing on things.
Thanks!!

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How would a literal eye on the back of the head work?

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