Naturally, I didn't even know about stereo vision, everything was flat and that didn't bother me.
But when I was about 20 years old, my friend showed me Virtual Boy. After looking into the headset I immediately sensed the depth and was blown away with it.
Even after I took off the headset, depth perception didn't go away ever since. It only became much stronger when I started wearing contact lenses.
Sorry for possible grammar mistakes, I haven't yet experienced anything like Virtual Boy but for English, which is not my first language.
I used to wear disposable lenses, but out of lazyness and frugality, I'd leave them in longer than I should have and suffered multiple eye infections. Fortunately, no serious harm resulted from them, but I recognized the risk and eventually switched back to wearing glasses. Since then I've never had to worry about that stuff ever again.
They're also much cheaper to replace than prescription glasses when damaged or scratched.
Safety glasses come in many models today - many look like sport sunglasses and come in clear, tinted, yellow, and shaded.
She is also famously clumsy, always tripping, dropping things, bumping into stuff, aiming poorly, etc.
I've often wondered if poor stereo vision is the cause of both of those.
* Accommodation: Our lenses are flexible. We unconsciously contract the ciliary muscles in our eyes to change the shape of the lens so that it focuses light at different distances. It's very similar to adjusting the focus ring on a camera or binoculars.
* Convergence: As an object moves closer to you, in order for the object to stay centered on the fovea of each eye, your eyes need to turn inwards. To look at something really close, you go cross-eyed. When looking at something far away, your eyes are parallel.
Both of those involve muscular control that also give feedback to your brain. So you can unconsciously feel how much your lenses are accommodating and your eyeballs are converging. Typically, those signals are in sync with each other.
Autostereograms break that. To get the effect, you need to look "through" the picture. When you do, each eye isn't actually centering the same part of the picture on its fovea. That way, each eye gets a slightly different image, and the differences between those two cause a parallax effect that we perceive as depth.
The problem is that as far as accommodation is concerned, the picture is close. The lenses really do need to focus on the picture itself to resolve a sharp image. But for convergence, your eyes need to be closer to parallel as if you were training your eyes on something past the picture.
Now your brain can tell these two things are out of sync and it gets very confused. Some people seem to have an easier time decoupling these things than others do. It ends up a feeling a little like patting your head and rubbing your stomach at the same time.
I hope this does not work the other way - you see stereo, look at a stereogram you are unable to view correctly and boom - you're stereoblind.
What? 5-10% of those with stereoblindness or 5-10% of the general population suffer with this?
I would have called BS on this, but seems legit, just lacking a bit on nuance
"It is widely thought that about 5% of the population have a lazy eye and lack stereo vision, so it is often supposed that most of the population (95%) have good stereo abilities. We show that this is not the case; 68% have good to excellent stereo (the haves) and 32% have moderate to poor stereo (the have-nots). Why so many people lack good 3-D stereo vision is unclear but it is likely to be neural and reversible."