It was plainly seen that God, in anger, was laying His hand heavily on uvea; and lo!
In the coloration of the eyes it is necessary to distinguish two factors, the uvea and the pigment.
When the pigment is wanting or is very scant, the fundamental blue or greenish colour of the uvea is apparent.
uvea u·ve·a (yōō'vē-ə)
The vascular, pigmentary, middle coat of the eye comprising the choroid, ciliary body, and iris.