Also spending a hour or more per day outside is good for myopia (all the near focusing for books, computers, iphones,
video games, texting, etc is creating a world wide epidemic of myopia especially among Asians). You should also read about amsler grid testing, print one out, put it on your refrigerator and look at it daily one eye at a time. That is because lacquer cracks and myopic macular degeneration can cause "wet" (exudative) macular degeneration.