  Quantum vision is currently emerging as an interdisciplinary field
synthesizing the physiology of human vision with modern quantum optics. We
recently proposed a biometric scheme based on the human visual system's ability
to perform photon counting. We here present a light stimulus source that can
provide for the requirements of this biometric scheme, namely a laser light
beam having a cross section consisting of discrete pixels, allowing for an
arbitrary pattern of illuminated pixels, each having a photon number per unit
time obeying a Poisson distribution around the mean. Both the illumination
pattern and the photon number per pixel per unit time are computer controlled,
offering simple and unsupervised scanning of these parameters. Moreover,
infrared light exactly superimposed on the stimulus pattern can be used for
acquiring exact information on the illumination geometry on the pupil. The same
light stimulus source can be used to advance pupillometry to a higher level of
control and precision, as current pupillometers lack spatial selectivity in
illumination. We present pupillometry measurements demonstrating the potential
of this source to offer a wealth of information on vision and brain function.
