And at night all cats are grey.
Just ask that Franklin guy!
Not necessarily so.
I was born with ambliopia which causes the person so afflicted to loose the central vision in one eye. Central vision is the result of light receptors, known as cones, when stimulated , they report colors to the brain which fades to black as the light dims. The remainder of the retina is populated with receptors, known as rods, which respond to dim colored light. The brain react to this as dim white light.
When you step outside from a brightly lit room on a dark night your ability to see anything is compromised because your irises are contracted to their smallest aperture. If you have ambliopia your eyes are preset to respond to very dim light as a white image. You can also capture images of movement which otherwise is not perceptible.
Such images will blink out as soon as you look in a different direction.
This phenomena often results in seeing 'ghosts'
Regards,
GtG