Iris scan
An iris scan is one method of biometric authetication. Using a small camera, an iris scan system examines the iris of the eye. It uses small details in the iris's make-up to uniquely identify an individual. The irises of identical twins are measurably different; there are even differences between the left and right eyes of an individual.
An iris scan can be performed from several inches to several feet away, so there is no need to undergo invasive biometric procedures. In addition, the iris of the eye contains much more information than a fingerprint, and the scans are more accurate than most DNA tests.
Studies show that irides are not immutable. Also, changes in the health of an individual can affect their irides.Advantages of iris scanning
Disadvantages of iris scanning