@mjg59 @VE3RWJ

Huh. I just took a piece of black sewing thread (should be about as visible as a small gauge needle, I'd guess) and managed to poke myself in the eye with it without noticing anything other than slight distortion in field of view in the process. When I hold it hanging down from my eyebrow, I can't notice it's there at all unless it moves.

Do you think this is somehow unrepresentative or that I'm different?

@robryk @VE3RWJ no clue

@jannem @VE3RWJ @mjg59

Do you see any part of the instrumentation that's close to your eye (e.g. the blade)? I don't doubt that you see parts that are further away.

@robryk @VE3RWJ @mjg59
You see *something* but no details.

But, say, a fine needle not mounted on anything and coming in from the side? Depends a lot on the light I think. Unless you have light sharply reflected from the needle (we're really good at detecting bright spots) you may well not be able to.

@robryk @VE3RWJ @mjg59
Biological vision is pretty complicated. We can see individual photons in some circumstances. We can miss large, clearly moving objects in others.