Not a movie trick. A small number of people can actually change the size of their pupils on command. Studies have confirmed this rare ability, including a 2021 case involving a German student who could voluntarily dilate and constrict his pupils by up to 2.4 mm just by engaging eye muscles — no light changes, no mental imagery tricks. It’s extremely uncommon, but it is real.
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BIOLOGY | HEALTH | MEDICAL on Instagram: "No, you cannot control your pupil size directly; pupil dilation and constriction are involuntary reflexes regulated by the autonomic nervous system in response to light and emotional states. However, some people can learn to change their pupil size indirectly by inducing changes in arousal, focusing their attention, or shifting their focus to near or far objects. The instagram post highlights a rare ability where an individual can consciously control the
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