A child notices that, after he is tucked into bed at night and the light is turned off, he can't see much of anything. but if he keeps his eyes open, over time he can see his toys scattered around the room. he doesn't know it, but this dark adaptation comes about because of the
This dark adaption is possible, because of the eyes ability to adjust to different light levels. Allowing him to see better a short period after the lights have been turned off.
