I have one normal eye and one eye that has no lens, so I only see vague shapes and colors in that eye. There's no shared focus, per se. (The bad eye literally

I have one normal eye and one eye that has no lens, so I only see vague shapes and colors in that eye. There's no shared focus, per se. (The bad eye literally can't focus at all) I don't typically "pay attention" to the bad eye. Usually, they are "separate" and I ignore the bad eye. Sometimes I have really funny lapses in depth perception. Driving at night when the road is wet (and there are lots of weird reflections) is particularly tough. I can't see 3D movies... mostly. Sometimes that magical 3D effect kicks in for a second or two. When it happens, it's pretty cool. Then it goes away. haha. But, my brain does seem to assemble information from both eyes somehow. I can actually play most sports pretty well. I'm pretty decent at softball and tennis. I also avoided a serious car accident once thanks to that shitty eye. Was nearly broadsided right in the driver's door by somebody on my "blind" side, but that eye alerted me to an oncoming car (jackass running a red light) approaching at fairly high speed. She sheared my front bumper clean off (instead of plowing into my door, possibly killing me because it was a tiny little sports car with little side impact protection) because I hit the brakes at the last fraction of a second. I would wager that the conjoined twins' experience may be something like this. (Obviously, with more eyes involved)