my understanding from the little I looked into it is that every language developed this differentiation between blue and green later in their development. I don’t have the references, just discussions with profs from the past. (80s-90s)
It’s interesting. At the time, all I could think was that the word ‘verde’ may have had connotations that just didn’t apply to eyes...
-JT
Another thought: if languages didn’t differentiate between blue and green until late, maybe it could be, after all, that we didn’t really perceive the difference until later in our evolution - or that people in certain areas didn’t.
-JT