Green Eyes are very rare

Green

A light green iris with small amounts of brown

Olive green eyes

Green is the least common eye color and as in the case of blue eyes, the color of green eyes does not result simply from the pigmentation of the iris. Rather, their appearance is caused by the combination of an amber or light brown pigmentation of the stroma, given by a low or moderate concentration of melanin, with the blue tone imparted by the Rayleigh scattering of the reflected light.^[3]

Green eyes probably result from the interaction of multiple variants within the OCA2 and other genes. They were present in south Siberiaduring the Bronze Age.^[51] They are most common in Northern and Central Europe.^[52][53] They can also be found in Southern Europe^[48]and parts of South Asia (Afghanistan, northern Pakistan and northwestern India), South America and North Africa. In Iceland, 89% of women and 87% of men have either blue or green eye color.^[54] A study of Icelandic and Dutch adults found green eyes to be much more prevalent in women than in men.^{[citation needed]} Among European Americans, green eyes are most common among those of recent Celtic and Germanic ancestry, about 16%.^[55]

also:
 "The mixed type of iris, midway between the hematogenic and the lymphatic, is most closely associated with the Choleric temperament. The texture is also mixed, with alternating dense and loose patches of fibers. 
According to iridologists, there are only two basic kinds of iris colors - the brown - hazel hematogenic and the blue - gray lymphatic. Those of a Choleric temperament often have green eyes, but upon closer examination, this is shown to be nothing more than blue or gray mixed with yellow discolorations. " http://www.greekmedicine.net/diagnosis/Facial_Diagnosis.html