Large pupils in low light

Large pupils in low light

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Credit: TREVOR CLIFFORD PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. Large pupils in low light. Close-up of a woman's face, showing how a person's pupils become enlarged when exposed to dim lighting conditions. This is caused by a relaxation of the iris sphincter muscle in response to the low light, a response known as the pupillary light reflex.

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Keywords: adult, brightness, caucasian, close-up, contracted, dark, darkness, detail, dim, eye, eyes, face, female, grey, human, iris, light intensity, lightness, low light, miosis, muscle, myosis, ocular, one person, people, pupil, pupillary light reflex, pupils, reaction, response, responsive, responsiveness, sight, small, sphincter, vision, white, woman, young

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