Apparently one of the guys involved in early Air Force space suit research had lost an eye in an accident (no, not Yeager, can't remember the name right off). It created a bit of a stir when they tested him post-accident and discovered that his depth perception had actually /improved/ now that he only had one eye.

Unfortunately, despite this, they weren't willing to let him go back to flying fighter planes, which is why he got into space suit research...