About 20 years ago I went to a theater to watch a movie, and at that point I had not been in a theater in 5 years.
It wasn't a big theater, but it had a large screen so I sat closer to the rear seating. About 10 minutes into the movie I went to tell management that the movie was not properly focused, and suggested they let the projectionist know. Several people came to check, and they all said it looked fine to them. I insisted they were wrong, but I stayed until the end. When I got home I told a friend what happened and mentioned that was the reason I preferred my own theater. He laughed, and then suggested perhaps my eyesight was changing. I laughed that off, but his comment stayed with me, so I did get my eyes checked a week later and learned that my distance vision had slipped to 20/25 left and 20/30 right.
Just saying.....
Jim