The collarette (a.k.a. the ruff or the autonomic nerve wreath) is a major landmark, and is ideally found approximately one third the...

Does iris structure change? Not withstanding injury or disease, the iris structure is extremely stable. So much so that iris biometrics...

Are pigments caused by toxins, heavy metals and or medication? Some of them can be for sure. One of the most common sites to see a...