My eyes have changed in reverse. A few years ago I was 20/50. I've noticed it was easier to see some things over time. This last visit I was 20/20.
As a follow up with Dave. A good optometrist does more than just decide if you need glasses. Mine keeps track of any signs of macular degeneration, which my mother has, and also a "pigmentation irregularity" in one eye that can be affected by sunlight much the same as a mole on the skin. So yes while I may not need glasses and one could consider that fact to be a waste of union benefit dollars, imo the annual visits are not a waste in their preventative measures.