Farthest Lateral Movement of One Eye

China

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Beihu-Chenzhou-Hunan, SAR, China / October 11, 2026

Yanhao Deng held a small ruler just under the left eye and swung that eye out toward the ear and back while the right eye held steady, filmed close up at home in Chenzhou, Hunan. Checked frame by frame against the ruler's millimeter marks, the pupil travels about 3 millimeters outward from center before coming back. Bring a mirror and a ruler if you want to go farther.

Tags: Human Body, face, eye, eyes

Rules

- Move one eye horizontally outward toward the ear and back to center; the result is how far the center of the pupil travels from its centered starting position
- Keep the other eye as still as possible throughout
- Measure against a millimeter ruler held just below the moving eye and visible on camera throughout
- Keep the head still and both eyes open
- Continuous, unedited close-up video with both eyes and the ruler clearly visible
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