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Yeah that sounds terrible. It would be much better to detect saccades and/or blinks.

You could replicate that with an eyeball mounted on gimbals.

Sure, you could replicate anything given enough budget. It wouldn't be trivial, as saccades and blinks are among the fastest motions made by the human body.

>Sure, you could replicate anything given enough budget

You just killed a person and extracted their eyes to use to open some door. I think you have the budget for something that you can make for $200 with Lego Technic...

If you're bad enough to kill a person with the desired eyeball, you might as well unlock the door with them before you kill, with a few threats and promises. (pretty ugly thought)

Doesn't work in e.g a lock chamber, which would ensure only one person is in it (which has it's own issues, e.g. weighting is more complicated than it looks).

>with a few threats and promises

There have been people tortured to death who never gave up important secrets, so that might not be an option...

The saccades has properties that also differ per person.

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