the alterations which happen inside the visual system itself or in visual comprehension as an outcome of persistent arousal, the wide range of light saturations over which photoreceptors are reactive alterations with extended exposure to darkness, and a multitude of visual aftereffects are elicited by acclimation of neurons inside the visual system.

VISUAL ADAPTATION: "Visual adaption will be covered next week, but only briefly, so it would be to your benefit to study it somewhat on your own."