Going blind here, one eye a little better than the other.
In my case, neither has peripheral any longer. Everything drops into the void, as I call it. It isn't black, black would be a thing...it's nothing. I can see nothing. It is no different than what's behind my head.
As far as what I can see, at present, is like layer of Vaseline on a pane of glass, covering more and more as time goes on.
I can only assume that it too, will drop into the void.

As I understand it, what you see consciously is not what your eyes see. Your brain interprets the incoming information, turns it into concepts, and then recreates the images again.

During my process of going blind, my brain started filling up the blind spots with what it thought was there, so it was common for me to see people that I thought were in my peripheral vision disappear as they reached my central vision, and after going blind all that remained were the hallucinations, which I still have today even 7 years after losing my sight. At the moment I'm sitting in front of my computer and can see a very blurry keyboard and display, but it's not real vision, as I don't even have light perception anymore. The images are so accurate in familiar places that at one point shortly after losing my useful vision I even had a psychotic break thinking that I had developed some kind of spectral sight.

These hallucinations concern me, because even though I never had hallucinations before my issues with blind spots and contrast perception began, I'm afraid that if scientists either find a way to regenerate my optic nerves and restore useful vision I will still not be able to trust what I see. Fortunately my hallucinations are not bizarre or scary like reports I've heard of people seeing Donald Trump sitting on their toilet or dead bodies in their bed.

Don't try this, it's not very good for you, but you know that thing where if you rub your eyes too hard and you see red and green splotches? Imagine that, only so intense you can't see through it.

u/Fridux nailed it. The absence isn't a color, it's an absence. Your ears don't look black to you, they're just absent from your field of vision.

Hold your arm straight in front of you and make a fist. That fist is roughly the size of the area I can see. Fortunately for me that's also the size of a cell phone screen. I'm one of the lucky ones. Everything outside of that little radius is overlayed with dark tv static, and the further outside of my viewable radius we go, the darker everything gets until it blends in with the void behind my head.

But I don't notice the static or the void, much the same as you don't notice the world outside of your cell phone screen when you're looking at it. That's why texting and driving is so dangerous - not because the cell phone is blocking your view of the road, but because it's the only thing you notice. I'm seeing the static now because I'm thinking about it while writing this, but in a few more minutes it will blend into the background and life will go on.

It depends on the cause of blindness. I temporarily lost my sight due to a severe eye infection. For me it was like looking through a bright white fog. In the beginning I noticed that black was grey and all colors were muted, as if it was overlaid with white. Things were blurry. As it progressed everything was white/blurry when my eyes were open, and grey when they were closed, instead of black. I could sort of make out vague patches of color but not distinct shapes and it was very painful to try to look at anything. It was too bright so I mostly sat in the dark with my eyes closed.

For most of my life my brain doesn't accept information from my bad eye, so everything looks 2D. If I close my good eye and try to look out of my bad, things are blurry and misshapen and a bit uncomfortably bright.

If I lose vision due to a migraine aura it starts with a dot in the center of my vision where my brain corrects it to look like the surroundings. Often I don't notice it but if I look at text or a bug or something it disappears. Over the next 20 minutes it enlarges and develops a jagged undulating rainbow along the edge in a crescent shape. The vision in the center is blurry and darker. Sometimes I lose peripheral vision, so it it either dark or just not there.

I can't speak for permanent blindness. I am losing vision over time and my eyes often correct things I can't see as people, insects, cats, or rats, trilobites, but only in my periphery. This is worse when I'm tired or having allergies.

I went from 20/20 to absolutely nothing. No light perception. Yes, it’s dark.. but also light. It almost looks like I am looking out into the night sky. Then take that night sky and overlay that on to white. That is what it “looks like” nonstop for me.
I also see what appears to be a light wave of motion going through / over / in the dark sky.

Not really, but it's different for everyone. I've been completely blind in my left eye since birth and it's just like nothing's there. I went blind last year due to scarred cornea and everything's just cloudy and grey. I can see a tiny bit but it's not useful. I can still see what I can see when I close my eyes.

I guess you could say my blind spots are black, but when I close my eyes I see shifting colors, not black so it’s not the same as that. It’s even different than when in a pitch dark place because I see static like in an old tv even when there is no light except in that spot. It’s just empty and I can really only see it because it’s tear drop shaped. Then around the edges of it it looks like falling silver glitter like at a new year’s party. So heavy I can’t see through it. Then there’s the white flashes that look very similar to a projector bulb burning through film. They move from left to right across my vision at random.

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