As a not quite middle aged dude, I only just now figured out how to see magic eye stuff. I tried a couple times in elementary school but didn’t get it so I stopped. Had a few drinks earlier, stumbled on some magic eye pic that I could see clear as day and it blew my mind a little
I’m one of the stereo blind. I was kind of glad when I found out from the eye doctor. It explained why I could rarely catch a baseball without getting hit.
So depending on why you might be able to train it. If you don’t have a lazy eye and have good vision you may want to look into it.
If your brain is just not fusing two good images there is a good chance you can train it to do so. Having done experiments in this field I can tell you it makes a measurable difference in performance.
A good read on the subject is below. The part where she first sees a tree in 3D is a good example of what you are missing.
Fixing My Gaze: A Scientist’s Journey Into Seeing in Three Dimensions by Susan R Barry