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I suspect you experience true blindness (briefly) during laser eye surgery, when the flap is cut in the cornea. I remember how odd it felt - the feeling of seeing nothing at all, not even darkness.

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Here's a reference, you downvoting HN twits:

http://www.realself.com/blog/terrible-lasik-surgery-complica...

"you have to pump the pressure up in the eye to about 6x normal in order to cut a good flap, as you can't cut an accurate flap in a floppy eye. The pressure is actually higher than your blood pressure, so the eye stops perfusing with blood, and you go temporarily blind."

I could see after the flap was lifted. This was 2005 so I don't know the procedure anymore, but I was supposed to keep my eye trained on a flashing dot while the laser ablated my cornea.

I meant when the blade goes into the eye. There were a few seconds after that before vision came back.

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