Here is a strange thing;
Did you know that people whose eyes are different colors (i.e. one eye one color and the other a different color) suffer (?) from HETEROCHROMIA?
That's correct. And that is the word. HETEROCHROMIA.
So, you know that most folks have eyes of the same color, which is HOMOCHROMIA!
Exactly. HOMOCHROMIA.
Which, I guess, means they are "homos", eye-colorwise.