Question

Why are we unable to see anything in a dark room?

Answer 1

The light sensitive cells on the back of the human eyeball called the Retina react to light striking their surfaces and signal the information to the brain. This means that for the human eye to react to visual information there must be a light source that bounces off of the object to be seen and then reflect off of that object through the lens at the front of the eyeball, through the vitreous fluid inside the eyeball and then impact upon the retina where the special light detection cells react. Complete darkness is by definition the absence of light in the visual frequencies that these special cells respond to. Therefor in complete darkness the eyes can not see anything because they receive no information the brain can interpret as images. Special electronic ‘night vision’ viewers are able to take light frequencies which the human eye does not respond to and convert them into frequencies within the human visual range creating an artificial image in the absence of visible light. typically these devices work in light frequencies in the infra-red portion of the spectrum to low to be seen with the naked eye and they often include an infra-red light source that the unaided human eye can not see to increase the detailed information they can use to create the artificial images.
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