December 6, 2019
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OK, it's time for a simple experiment - which is the only kind I'm capable of. Don't try this if you're driving please. But if you're where you can do this safely, pick up some object that's close by: your pen, your comb, a cup - whatever. Hold it about a foot from your eyes. Now, move that object slowly toward your eyes - you're not driving, right? OK. But keep staring right straight at the object. Now bring it all the way up to your face. If you keep staring at the object, I'll bet something strange has happened to your eyes. You are suddenly cross-eyed and everything looks weird!