Sorry, we don't allow throughout history questions. These tend to produce threads which are collections of trivia, not the in-depth discussions about a particular topic we're looking for. If you have a specific question about a culture/region and time period, please feel free to re-compose your question and submit it again. Alternatively, questions of this type can be directed to more appropriate subreddits, such as /r/history or /r/askhistory.

Meanwhile, you can get started on this section of the FAQ

http://www.reddit.com/r/AskHistorians/wiki/health#wiki_eyesight.2C_glasses.2C_and_contact_lenses