Sensory Adaptation

Sensory adaptation is a very incredible process of the body. It is the way our body adapts to new experiences, or diminished sensitivity as a consequence of constant stimulation. The way you adjust to smell, touch, and sound are all covered by sensory adaptation. For example, when you first get into a pool, and it's freezing cold. In a few minutes, the water becomes nice and you forget about the temperature altogether.
For eyesight, however, sensory adaptation is different. Why is it that after staring at something for a long period of time, we continue to see it? …