Upon emerging from a darkened area like a movie theater during daylight,our eyes are initially extremely sensitive to light.This is because

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The sensitivity of the eyes to light is influenced by the amount of retinal in the cis conformation. In darkness, the proportion of retinal in the cis conformation increases, which makes the eyes more sensitive to light. When we emerge from a darkened area, the proportion of retinal in the cis conformation remains high initially, making our eyes extremely sensitive to light.

Upon Emerging from a Darkened Area Like a Movie Theater