re: #149 Dangerman
Eye tests in school caught my nearsightedness. It was quite the surprise to actually see clearly for the first time in grade school.
What they missed at the time was a mild convergence/double vision issue. Not severe, but it probably contributed to my complete inability to catch a baseball etc.
Many years later, the double vision got worse, and I spent a few months driving around with one eye closed. Fortunately a simple prism correction in the glasses dealt with that.