How do I know if someone has hazel eyes or green eyes with central heterochromia?
What would you classify pic related as?
I'd say it blends in (that is I can't tell where the 'border' is) and therefore is real hazel, but I'm not sure, as I can clearly tell the two colors apart.

On a side note, even wikipedia's examples of 'pure' green eyes seem to have some gold/brown in them, so does 'pure' green even exist?
https://en.wikipedia.org/wiki/Eye_color#Green