1. An apparatus for iris image acquisition and positioning of an iris of a subject for iris image acquisition, the apparatus comprising: a sensor configured to acquire an image of the iris of the subject for biometric matching; a display configured to display an image of at least a portion of the subject's face; and a processor operably coupled to the display and configured to send a signal to the display so as to cause the display to render a first image of a first eye of the subject relative to a second image of a second eye of the subject such that a relative separation of the first eye and the second eye is modified for the subject and both the first image and the second image are located near or at a physical location of the sensor, the rendered first image of the first eye providing feedback to the subject regarding occlusion and/or foreshortening of the iris of the subject with respect to the sensor.