  We give a complete proposal showing how to detect the non-classical nature of
photonic states with naked eyes as detectors. The enabling technology is a
sub-Poissonian photonic state that is obtained from single photons,
displacement operations in phase space and basic non-photon-number-resolving
detectors. We present a detailed statistical analysis of our proposal including
imperfect photon creation and detection and a realistic model of the human eye.
We conclude that a few tens of hours are sufficient to certify non-classical
light with the human eye with a p-value of 10%.
