I think, as a person with green-blue eyes, that in some cases eyes might appear to change color based on things like increased or reduced redness in the eyes and skin. For example, when I have been crying, my eyes look bright green. It’s not likely to be because my eye color changes, but rather because the increased ruddiness in my skin makes the green tones in my eyes appear more vibrant. Anecdotal stories about peoples eyes changing with their moods have never struck me as being evidence based.
@Dutchess_III when I was a little girl I had very bright blue eyes and as an adult I have “green” eyes (I have grey-blue eyes with brown central heterochromia, most people call them green.)