here and here.
Now I have found another squirrel from a different location that does the exact same thing! This squirrel climbed to the side of a tree as it saw me approaching, which is a defensive move I've seen several times. Sometimes the squirrel will run up the tree if things are very dangerous, but they will run behind the tree if the threat is not so great.
This squirrel decided I wasn't much of a threat to him, so he turned to his right and ran behind the tree. All the while I was quickly taking pictures in rapid speed one by one. I usually don't get to see the closeup details until I get home, but can you guess what the photos revealed to me?
Now we all can be reasonably sure that if it is an eyesight problem, more than one squirrel has it. It seems like too much of a coincidence though that I could catch two different squirrels in a month showing this same habit. It must be more widespread than just poor eyesight. I think the squint is something more like when we close our eyes when we sneeze. There is most likely a natural reason why squirrels do this.
That's it for today. I think I showed that it's reasonable to assume that squinting might just be a common thing for squirrels. It's probably not poor eyesight, but something completely different. Now I wonder if I will be able to catch another squirrel doing this very same thing. I'll be trying.