Why Can't You See Clearly When You First Go into a Dark Place?

There are two kinds of cells in each person's eyes. One kind sees things in bright places, and the other sees things in the dark. The cells things see things in the fight work in the daytime and under lamps, and the others work in the dark. When you enter a dark place, your eyes must adjust from using one kind of cells to the other. Also, the pupils of your eyes expand to use all of the light from the dark place. When you go back into the light, the pupils contract to keep too much fight from entering the eye, and you blink to help the eye have time to adjust.