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> then suddenly having the opportunity to open both eyes, and how surprising it would be to realize that you have depth perception

As someone who is stereoblind, I really wish opening both eyes leading to depth perception were true for all of us...

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Not the parent, but I had no idea that existed myself. What's the actual cause if vision in either eye works fine otherwise? The wikipedia page (http://en.wikipedia.org/wiki/Stereoblindness) wasn't too helpful.

For me, my eyes were slightly crossed as a kid. Had a couple of eye surgeries to align my eyes correctly, but the pupils were not aligned vertically perfectly, causing slightly conflicting images from each eye, and thus causing the brain to use the image from one of the eyes as opposed to fusing the two images as those with stereo-vision do. Both eyes still work all the time, the non-dominant eye at any given time just provides peripheral vision.

I don't remember the source, read this over six years ago, but there was a case where a women born with stereo blindness just suddenly regained depth perception.

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