What is the function iris? what is persistence of vision
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The function of the iris is to control light levels in the eye. The round, black dot in the center of the iris is called the pupil. ... The sphincter muscle lies around the edge of the pupil. In bright light, this muscle contracts, allowing only a small amount of light to get it.
persistence of vision. The retention of a visual image for a short period of time after the removal of the stimulus that produced it: the phenomenon that produces the illusion of movement when viewing motion pictures.
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