My driver's license says I have hazel eyes because that's what I told the DMV people when I went for my driver's test.  The dictionary defines hazel as "A light brown or yellowish brown".  I know one thing:  My eyes aren't yellow and don't have much brown.  So what's the deal?  Wikipedia says, "Hazel is usually used to describe eyes that contain elements of both green eyes and brown eyes, sometimes transitioning from green at the edges to brown around the pupil."  I could agree with that definition.  But I think the definition for grey also sort of applies.  Who knows.