The eyes can change color depending on our humor.
This can happens too because of natural causes, like some disease or simply for oldness, becoming thus, permanent changes. The temporary changes can occur due to our emotions.
According to specialists, the temporary changes don’t pass from illusions, because they happen due to light reflexes that we receive. Already who have dark eyes, hardly these reflexes are noticed.
In situations that unleash several emotions, the change can appear as a contraction or dilatation of the pupils, so, the light penetration is low or high.
Our iris just have color due to melanin, otherwise, would be a whitish tonality.
Due to the combination of several genes we have just one color of the eyes, just like our prints. Any abrupt change, temporary, the best to do is always look for a doctor.