Dark adaptation: The term dark adaptation refers to the phenomenon through which an individual's eyes can adjust to darkness after he or she has been exposed to light for a specific period. Eventually, the eyes adapt to the darkness by recovering it and becomes more sensitive in dim light. It happens after the pupils of a person gets dilated and changes or alters the cones and rods of the person's eyes.
In the question above, Cathy has experienced the phenomenon known as dark adaptation.
