Not sure about the scholarly literature on it, but my eye doctors (several different ones over the years) have almost always mentioned how it's better to slightly undercorrect the vision, so that the eyes still have to work a bit at focusing. They implied that to do otherwise could speed the degradation of your vision.

I am from the East. We rely on common sense and what has _actually_ worked for us in our life, and what has worked for generations. I take studies done in the West (esp wrt health) with a pinch of salt. (Which reminds me of the fad about low-salt for which their are many authoratative studies and research but its still not true)