How does rhodopsin help someone to see in the transition from a light environment to a dark environment and vice versa?

Rhodopsin is a substance in the rods which allows the eyes to adapt to variations in light. Opsin and retinal (a chemical like Vitamin A) are the two parts that make up rhodopsin. These two components break apart in bright light and only reform when the eyes must adapt to darkness.

An example of this is when you go into a movie theater and your eyes must adjust to the total darkness by combining the two components and then you are temporarily blinded by light when you come out of the theater until the components once again break apart. More.

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