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For how long must light be emitted for a human eye to perceive it?

  • Would a person notice a flash of light that lasted 10 ms?
  • Does the intensity of the light matter?
  • How much light is a photon, anyway? Does is take thousands or trillions of photons interacting with the eye to register as light?

1am where I live and I'm wondering

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[-] threelonmusketeers@sh.itjust.works 22 points 3 weeks ago* (last edited 3 weeks ago)

A 2016 Nature study

To be more specific, this study in Nature Communications: https://www.nature.com/articles/ncomms12172

Edit: Ha! NoSpotOfGround beat me by 2 minutes.

this post was submitted on 24 Jun 2026
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