Blind Spot

The point at which the optic nerve perforates through the retina is clearly visible in this image. Because the vertebrate retina is reversed, i.e., the light sensitive elements are on the outside, it has to be this way. All the bundles of nerve fibers from the ganglion cells are converging on this locality.

Naturally there is no sensitivity at this point. The retinal structure comes to an abrupt end on either side of this blind spot. Actually, of course, this is a "hole" in the light sensitive portion, and you're seeing it in two dimensions.

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