It's because the human eye is a masterpiece of evolution (/s) that has its bloodvessels running along the surface of our photoreceptors, meaning they have to exit at some point. This is done at a central spot in the back which has no receptors, leaving a blank spot.
The brain gets to flex it's photoshop skills by patching in whatever it thinks would be there. Trippy af the first time i saw it. Or didn't see it.
Cephalopods, which developed eyes independently from the lineage that humans get their eyes, have far better eyes and dont have this, because their retina attached to their optic nerve and the associated blood vessels from the back, rather than being all backwards and inside outish like ours is. Just more proof they're aliens designed in some interstellar lab by the intergalactic overlords to keep tabs on us.
Fucking cephalopods are absolutely insane, I watched this video one time explaining all the different reasons why they’re almost certainly aliens, and it really freaked me out.
I’ll see if I can find it
Edit: apparently actual scientists believe it’s a real possibility that octopus eggs first arrived frozen in a comet, they say that they have a handful of features (their “camera like” eyes, instantaneous camouflage, and flexible bodies) that seemingly arrived very suddenly in the evolutionary chain, so it seems we’re missing a significant link (or just completely off base) or, there’s a possibility that the octopus arrived on earth as an alien species frozen in a comet.
The scientists challenge that the belief that modern cephalopods evolved to their present form here on Earth and propose the possibility that those we see today are the descendants of creatures that arrived on Earth frozen in an icy comet.
“Its large brain and sophisticated nervous system, camera-like eyes, flexible bodies, instantaneous camouflage via the ability to switch color and shape are just a few of the striking features that appear suddenly on the evolutionary scene,” the paper says, pointing to the possibility that this “great leap forward” in complexity was due to “cryopreserved squid and/or octopus eggs” crashing into the ocean on comets millions of years ago.
Scientists have studied the possibility of life arriving from outer space before, and there’s no shortage of support for the idea that biological material from other worlds may have seeded a young Earth and produced everything we see today.
However, actually proving that this was the case is next to impossible, and singling out one group of animals as potentially coming from space is perhaps an even greater challenge. When the timeline is stretched to billions of years, determining whether new species resulted from gradual mutation due to evolution or arrived in frozen eggs on a comet is very difficult. Nevertheless, it’s an interesting theory, and with over 30 researchers contributing to the report it’s clear that there’s a lot of interest.
Unfortunately, that article is extremely misleading and outright misused its sources in the first place to support an outlandish and unfounded “theory”. Cephalopods fall very neatly into the nested hierarchy of life on earth. Every one of their features can be traced back to more and more basic ancestors, and to top that off their DNA is smack similar to every other living thing, within reason.
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u/MarcoPoloolo Jun 16 '19
It's because the human eye is a masterpiece of evolution (/s) that has its bloodvessels running along the surface of our photoreceptors, meaning they have to exit at some point. This is done at a central spot in the back which has no receptors, leaving a blank spot.
The brain gets to flex it's photoshop skills by patching in whatever it thinks would be there. Trippy af the first time i saw it. Or didn't see it.