1. A method of positioning an eye of a subject to be photographed by a camera comprising the steps of: a. selecting a specific location in space within a field of view of the camera at which an eye of the subject is desired to be positioned; b. providing a mirror at a fixed distance from the selected specific location in space such that the subject can see a reflected image of his eye at a particular spot in the mirror only when his line of sight is a segment of a line that passes through the selected specific location in space; c. directing a collimated light beam in a manner so that the light beam passes through the selected specific location in space; and d. instructing the subject to position his head so that he sees an image of his eye at a particular spot in the mirror and also sees the collimated light beam.