Iris biometrics

Principles of iris biometrics

The iris is the elastic, pigmented, connective tissue that controls the pupil. The iris is formed in early life in a process called morphogenesis. Once fully formed, the texture is stable throughout life. It is the only internal human organ visible from the outside and is protected by the cornea. The iris of the eye has a unique pattern, from eye to eye and person to person.

How does iris biometrics work

An iris scan will analyze over 200 points of the iris, such as rings, furrows, freckles, the corona and will compare it it a previously recorded template.

Glasses, contact lenses, and even eye surgery does not change the characteristics of the iris.

To prevent an image / photo of the iris from being used instead of a real "live" eye, iris scanning systems will vary the light and check that the pupil dilates or contracts.

Benefits of retina biometric systems

• Highly accurate: There is no known case of a false acceptance for iris recognition
• Not intrusive and hygienic - no physical contact required

Weaknesses of retina biometric systems

• The user must hold still while the scan is taking place

Applications of iris biometrics

Applications include: Identity cards and passports, border control and other Government programmes, prison security, database access and computer login, hospital security, schools, aviation security, controlling access to restricted areas, buildings and homes.