How does the eye respond to a sudden shift in light? include the following parts of the eye; pupil, lens, retina, rod and cone cells, optic nerve, brain?

1 Efficiency; 2 Ambient light response; 3 Dark adaptation

Ibelieve it would be d (side effect) sorry if i'm wrong(:

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other.