The word iridescence is derived in part from the Greek word iris (pl. irides), meaning "rainbow"; which in turn derives from the goddess Isis, who is the personification of the rainbowand acted as a messenger of the gods.

It's just the way that people are born. Everyone is born differently. Also if you have small irides you probably hate exercise and love to sleep all day.

Iridology.

Clinical Iridology is the functional equivalent of a whole-body MRI or CT scan, reporting the state of each organ, system and body tissue in a distinct region of the eye, the blue or brown irides.

Any optometrist can read and photograph the irides; a trained, experienced Iridologist can interpret the findings, without intrusiveness or risk.

Instead of relying on ever-changing computer algorithms and specialized radiological analysis, Iridology is the body's own internalized log, yielding a wealth of information in a ten minute non-invasive scan.

nColour of the iris is usually brown .

nIt is because of the pigment melano cysts

nThe blue colour of the iris is because of the less amount of melano cysts pigment

nIncreasing amount of iris pigment produced green hazel and brown iris

nRarely one iris can be different colour than the other iris. This is know as hetrochromia irides