I write this article from personal experience. When I was 13, I developed shortsightedness or myopia almost overnight. I had terrible headaches reading, and after many weeks of suffering, was finally prescribed glasses that made me able to read without a headache again.
At first I found wearing glasses pretty cool. For once in my life I looked like a ‘good’ girl by convent school standards. Spectacles meant you were the studying type. My glasses were photo-sensitive which meant they turned dark when I was out in the sun. That made me very cool riding on my bicycle (or so I thought, till an old teacher told me only criminals and film stars wore dark glasses and I better come back to reality).