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SESK: Stuff Everyone Should Know · sesk.info/pilot-night-blind-spot

At night, why can an object vanish if you stare straight at it?

The fovea has no rods, creating a night blind spot.

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  1. Your eyelids close a little at night
  2. The center of the eye has no rods ✔
  3. Cones work better in the dark

Why: Rods handle dim-light vision, but the fovea in the center of the eye has only cones. That leaves a blind spot covering the central 5 to 10 degrees of your view at night.

Huh, didn't know that: The AFH says rods are about 10,000 times more sensitive to light than the fovea.

The dad joke
I stared at a light all night and it disappeared. Must have been shy.
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References

Answer: The center of the eye has no rods. Rods handle dim-light vision, but the fovea in the center of the eye has only cones. That leaves a blind spot covering the central 5 to 10 degrees of your view at night.

  1. Airplane Flying Handbook FAA-H-8083-3C, Chapter 11 www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/airplane_handbook/12_afh_ch11.pdf
    This absence of rods affects the central 5 to 10 degrees of the visual field.
    Checked 2026-10-09.

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