Your eyes will adjust to low light situations, but there are limits. Your eyes will never adjust to see in total darkness. However, the light detectors in your retinas are always randomly firing. This noise is not detectable in lighted situations, but you might perceive them in total darkness. There is also 'noise' through out you visual cortex, so you might see shapes, color, motion, pattern...but regardless, an such perceptions would be very short lived and non-defined.