> Perhaps myopia turns into astigmatism if you squint too much? In my case no. I started with -2.5 for myopia, and was squinting pretty hard for a few months b

> Perhaps myopia turns into astigmatism if you squint too much? In my case no. I started with -2.5 for myopia, and was squinting pretty hard for a few months before that. Had no astigmatism Then I got a bad habit of scratching my eyes whenever I slept too little time. While this happened my astigmatism increased by 0.25 D each year, for 4 years in a row