𝐖𝐢𝐬𝐝𝐨𝐦 𝐨𝐟 𝐤𝐧𝐨𝐰𝐥𝐞𝐝𝐠𝐞 on Instagram: "However, a very small number of people can voluntarily control their pupil size. Instead of relying only on light changes, they can consciously make their pupils widen or shrink, often by focusing their attention, breathing, or visual imagination. Scientists believe this rare ability is linked to unusual awareness or control over parts of the autonomic nervous system, which usually works automatically. While it’s fascinating, it’s harmless and