#adaptation  (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light)
  supertype:  alteration__modification__adjustment  the act of making something different (as e.g. the size of a garment)
  subtype:  dark_adaptation  the process of adjusting the eyes to low levels of illumination; cones adapt first; rods continue to adapt for up to four hours
  subtype:  light_adaptation__lightadaptation  the process of adjusting the eyes to relatively high levels of illumination; the pupil constricts and the cones system is operative

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