I could always read, it was the far away stuff like the blackboard that caused problems. Never too big a problem in the lower grades because they knew I was hard of hearing and sat me in the front. Also, because lower grade teachers tend to write LARGE on a blackboard.
I do tend to think that it was relatively unknown for a doctor of any sort to be called upon in that time period. It was the Depression after all, and poor eyesight was not exactly life threatening. The Dr. was called only as a last resort when it was usually too late to matter. Such is never the case with not being able to see.
I don't really remember not being able to see (and I should!) but I do remember being nauseous for a couple weeks after getting the glasses.