Eye color indicates how well a person handles pain, how competitive a person can be and how trustworthy a person is, according to Medical Daily. Eye color is decided by multiple genes, some of which are linked to other parts of the body.
One study showed that women with lighter eye color experienced less pain during child birth than women with darker eyes. Another study of 40 males and 40 females showed that people with brown eyes are more likely to be perceived as trustworthy than people with blue eyes. In a study in Australia, people with blue eyes were less agreeable and more competitive than people with brown eyes, but the results did not hold true in Europe.