When I was younger, my ophthalmologist was still testing for depth perception through binocular disparity (the parallax effect, I think). I could pass those tests (although my mother is in the 20% or so of the population that can't do it), but I never could see those stereoscopic images for some reason.

I haven't been tested for many years, but I assume I have lost this type of depth perceptiion due to monovision after cataract surgery. I still have functional depth perception, but it must rely on other clues these days. And I still can't see stereoscopic images.

At least there are tools now that can undo the process by which these images are produced.

I struggled at the beginning and was almost certain I was one of the small percentage who can't see them, but after working on it for a while I managed to see them. Now I use them to relax my eyes with the parallel mode. I remember not being able to properly align the two images on a stereo microscope without pulling outward one of my eyelids (which in turn adjusts one eye). I did the same for the magic eye until I was able to see the stereoscopic image form, then I no longer needed to do that.

I was able to perceive all of them, using the "focus on something behind the plane of the monitor surface" technique (rather than the "bring your face up close and slowly move away while keeping your eyes focused the same" technique, which I find has been a bit hit-and-miss).

I found that the π and ∞ stereograms were easier for me than the graph ones, as it's easier to snap to focus once you recognise the general outline of the shape. The graph ones were a bit harder for me, although that may just be the colours used.

Works easily for me. There are two types of stereograms (cross-eyed and parallel) so perhaps you had success with the other type. I believe this are parallel (aka "wall-eyed".)

They're a mix. I find the mathematical symbols ok but they don't jump out very much which seems to make my eyes reluctant to stay with the illusion. The first (green) surface one is one of the best magic eyes I've ever seen, but the second (pink) one I can't get to stay at all.

These posters were around in the 90s. After a few tries I “got it” and was able to see them. It was frustrating initially.

Popular enough to be on Seinfeld.

https://youtu.be/Uy9D0lO_0y0?t=38&si=f9zczm_noVd9hsmN

“Computers make these.. big computers”

I remember when these things first came out and they were everywhere. I've never ever gotten them to work for me.

I used to be able to see these but as my nearsightedness progressed at some point I lost the ability.

Seems not everyone, and it appears that seeing them is a combination of skill and vision.

Never been able to see them, but my eves have different enough vision that it is hard to make them work together at certain distances.

The intended way (when image floats above background, closer to you) - no. I can see images if I cross eyes and let patterns merge. However, this way images appear below background and are harder to recognize.

Every single time I tried it in the past, I failed. I never got them to work for me.

i get colourful snow and a headache trying to make my eyes do things. it just blurs and unblurs :'(

Working on my computer