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MEDICAL | STUDENT on Instagram: "Some people have the rare ability to control their pupil size without any changes in light. This means they can dilate or constrict their pupils at will, regardless of the surrounding environment. This unusual ability is linked to the iris sphincter muscles and dilator muscles, which are typically controlled involuntarily by the autonomic nervous system. However, in these rare individuals, the brain's neural pathways allow for conscious control over these muscles
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