My experience seems somewhat consistent with this. I became moderately myopic after doing professional calligraphy for a few hours every day for a year or so (a

My experience seems somewhat consistent with this. I became moderately myopic after doing professional calligraphy for a few hours every day for a year or so (a few hundred thousand words total). But I decided not to get any glasses. Over the following years the myopia did not get worse, it improved a little.