<prompt> Which of the following is used for biometric evaluation?IrisPupilLensCornea  <response>: Each persons Iris has a unique pattern which is not changed from bih until death. The pattern is different even in identical twins. Retinal scan is performed by casting an undetectable ray of low energy infrared light into a persons eye as he looks through scanners eye piece, which outlines a circular path on the retina. The results of the scan is conveed to computer code stored in database. Retina patterns may be altered in cataracts, glaucoma, retinal degeneration diabetes. 