It is an obvious process that when an individual moves from dark to light, he fails to see for some time but after a while, visibility becomes normal. It is a prominent example of

During the dark adaptation of the human eye, its visual threshold minimises to a small fraction of its original value in the light. An analysis of the quantitative data signifying this adaptation shows that it follows the course of a bimolecular chemical reaction. It makes the rods functional. It takes some time for rhodopsin to be reformed. This is why, on entering a dark room at daytime or on coming out of a well-lit room at night, we feel blind for a while.