Lost binocular vision for a number of years back.

You get around just fine without it. Got it back after some speciality glasses (PRISM).

Was a complete shock see depth again. Didn’t seem to help anything getting it back. Mostly just trippy. Chairs were amazing to stare at.

From a much shorter and very different route, once after an 18 hour straight Quake marathon, I looked around the my room and was startled at how everything looked. I was highly impressed by the graphics and depth perception.

This reminds me of the 'Tetris effect' in which people who play Tetris for prolonged periods of time will begin to experience Tetris-like hallucinations when they stop. I've experienced it myself and have trouble explaining it, but it's as though everything you see becomes Tetris-like in some way. You look at your dinner and see ways to rearrange the peas so they 'fit' with the mashed potatoes, or something like that. There's more to it than that though, there's a real sensation of things being moving blocks that must be fitted together. It's bizarre.

But unlike Quake, Tetris isn't providing you with a 3D experience. That makes me wonder how much overlap there is between the two experiences.

I took an art class a few years ago. Negative space drawing and perspective drawing will blow your mind after a 3 hour session.

Walking outside you see lines and shadows everywhere. Entire perspective changes.

I’m curious to hear more. What caused you to lose and then regain depth perception? Were you able to see with both eyes or did you lose vision in one eye temporarily?

Mix of minor strokes and high intercraniel pressure.

My vision would switch from one eye to the other roughly every 30 seconds. Mostly seamlessly. Took ages to figure this out. Had some minor left brain issues. So writing would go gibberish every 30 seconds. Keeping a patch on right eye meant my vision went black every 30 seconds but my writing was fine when I could see.

Left eye being patched meant writing mostly gibberish. Still had blackness every 30 seconds.

Going on blood thinners resolved the vision going black and gibberish problems.

Prism glasses fixed double vision problems.

Medication for cranial pressure removes the need for prism glasses for about 10 hours. I have several extremely different pairs of glasses depending on what my brain is currently doing.

Inhaled some caustic gas a few years ago. My blood went “sticky” from it. Apparently it activated a Latent blood disorder.

This is the most interesting thing I've read today! Thank you for sharing!

Thanks! Took 3 years of hacking mind and body while mentally deficient to figure it all out. Leaned a lot from it all. Kind of forgot a lot too, but got most of it back now.

Would take memory tests daily or more to see how “stupid” I was.

Graphing my own cognitive decline and eventual resurgence was “interesting”

Whoa, I’m really sorry to hear that. Your story is fascinating and reminiscent of Michael Gazzaniga and others’ work with split brain patients.

If prism glasses helped regain depth perception, then probably something went wrong with eye motor function, causing diplopia (double image due to misalignment of eye). Could be trauma to the eye socket? Vision loss in one eye i think can be ruled out.

Sixth cranial nerve issue. I can keep eyes aligned, but is extremely difficult and painful if cranial pressure is high.

Reducing pressure resolves the issue.

Both eyes are very healthy.

At worse it’s +24 diapors, -1 power.

When pressure is good it’s 0-2 diapors +3power.

For awhile it was -6 diapors.

At this point I have glasses for much of the range.

Temple pain tells me when it’s time to switch glasses.

Avoiding caffeine and other stimulants helps.

Taking a Diamox will drop pressure in a couple of hours.

There is either a book or a great Joe Rogan podcast in your story. Thank you very much for sharing.

We can also go up and down abstraction levels at will.

We can see a forest, then a tree, then a leaf. All different "objects", yet related. The ability to not distinguish each blade of grass in my yard and just see it all as "grass" is very useful for noticing and not stepping on what the dog left behind.

Note that the human system fails for things like the moon which look vastly different in size at different times. This is proof of your point.