Editing Stimulus modality (section)

===Adaptation===
The eye is able to detect a visual stimulus when the [[photons]] (light packets) cause a photopigment molecule, primarily [[rhodopsin]], to come apart. Rhodopsin, which is usually pink, becomes bleached in the process. At high levels of light, photopigments are broken apart faster than can be regenerated. Because a low number of photopigments have been regenerated, the eyes are not sensitive to light. When entering a dark room after being in a well lit area, the eyes require time for a good quantity of rhodopsin to regenerate. As more time passes, there is a higher chance that the photons will split an unbleached photopigment because the rate of regeneration will have surpassed the rate of bleaching. This is called [[adaptation (eye)|adaptation]].<ref name=Carlson />