Feb
Sorry to ask, but my curiosity got me
Answer:
There are actually various ways that “crossed eyed” people can see:
1) Their brain picks one eye, usually the dominant one, and uses just that one. The other eye is allowed to atrophy and the vision out of it becomes minimal or non-existent.
OR
2) Their brain “merges” information from both eyes by ignoring the parts of the vision that over-lap. It can do this because the brain is astonishing at adapting to strange visual situations. A famous experiment in the 1970's had people wear glasses that either showed the world upside-down, or showed them two overlapping images. In both cases, people gradually adjusted to this type of vision and were able to walk, drive, run as they did before. Once the glasses were removed, they couldn’t function until their brain re-adapted.
OR
3) The brain causes both eyes to atrophy and instead chooses to see only the absence or presence of light (and sometime colors). Basically its like putting your head in a white plastic bag. You can't see distinct shapes, but you can tell if the lights are on or off. This is the type of vision that kids with congenital Nystagmus, crossed yes, and certain developmental disorders often end up with.
Having both eyes crossed is usually only seen in children with severe developmental brain disorders these days because crossed eyes is often a muscle imbalance that can be corrected surgically in otherwise physically and developmentally normal kids.
Answer:
Most people with crossed eyes only have one that does that, and usually that eye has shut down early in life and had no vision. So, for the better part they see fine out of the eye that is normal. I’ve been an optician for over 28 years and have never seen someone with both eyes like this.