Some doctors say get them and say any works, some specify brands, and many doctors say don't get one as long as you have not been prescribed powered specs and s

Some doctors say get them and say any works, some specify brands, and many doctors say don't get one as long as you have not been prescribed powered specs and since this is one of those things related to medical field that one can't just do it on their own based on things read on the Internet, so I end up never getting one.