No, it is not accurate to say that someone's eyes turn black when they are in a rage, and this claim is not supported by scientific evidence. Changes in eye color due to emotions, such as rage, are not a known physiological response.
Eye color is primarily determined by the amount and type of melanin in the iris, which is a genetic trait inherited from one's parents. While emotions can affect the appearance of the eyes, they typically do not cause changes in eye color.
During moments of intense emotions, the pupils may dilate or constrict due to the autonomic nervous system's response, but this does not alter the actual color of the eyes. Dilated pupils can make the eyes appear darker, but the underlying eye color remains the same.
Claims of eyes turning black during rage are likely to be based on misinterpretations, exaggerations, or a result of heightened emotions influencing perceptions. It is essential to approach such accounts with a critical mind and not take them at face value.
If your friend's ex-boyfriend is displaying concerning behavior, it's crucial for your friend's safety and well-being to encourage her to seek support from friends, family, or professional resources. Violent or abusive behavior is never acceptable, and it's important for individuals to prioritize their safety in any relationship. Encourage your friend to seek help from a counselor, therapist, or a domestic violence support organization if necessary.