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Originally Posted by harmonygirl REALLY COOL! Where they disappear, is this where your nose interferes with the field of vision? |
I don't know as for anybody else's nose, but as for my nose, you guessed: it’s really great!!! Even some people instead of shaking my hand shake my nose by mistake, but as for test, as you noticed, a nose remains on the side of closed eye, so it “isn’t to blame” for it. I read the part of psychology – perception, trying to find out the answer for the phenomenon, mentioned in dustin archibald’s post, but in spite of the fact that the author of this book is one of the best psychologist - Revaz Natadze, I couldn’t find the explanation, so I will have to offer my solution about it, but I’ve almost forgotten the construction (anatomy and physiology of eye).
But when reading the part – vision and its sensitivity, I reread and remembered the anatomy of the retina: there are two different kinds of receptors on it – rod cell and cone cell (of retina) but the
place on the retina, where the optic nerve (
nervus opticus) comes out, is deprived of receptors, so this point is never irritated by light, so is called “
a blind point” and the part of picture, which falls on this “blind point” isn’t perceived.
The diameter of the “blind point” is 1.8 mm, but it makes an angle of 6 degrees in the field of vision. When looking binocularly (with both eyes), this defect of vision isn’t detected by person, because the field of vision of the second eye covers it. Even with closed one and moving second eye this defect of vision isn’t detected, because “blind point” is moving, and part of the picture, fallen on it also is moving to another part of retina,
i.e. this point is detectable only with closed one and fixed another eye. I found this test in this book and offered my modification - animation about it,
so I took it from the book and didn’t work it out…