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

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The improved sensitivity of rods over time is responsible for dark adaptation, allowing the child to see in low light conditions after a period of adjustment. Cones are more involved in color vision and function better in bright light, while amacrine and horizontal cells play roles in image processing rather than light sensitivity adjustment.  Dark adaptation is the gradual improvement of the eyes' sensitivity after the level of illumination changes from bright to near darkness. As time passes in the dark, rods become more sensitive than cones and are able to respond to the lower level of light.

A Child Notices That, After He Is Tucked into Bed