Diff anon, but your comment reminded me of an important point...
Just because people 'can' wear planos doesn't mean they are able to. I have plenty of anecdotal experiences that comes to mind.
Also part of the reason I carry around saline eye drops because cosplayers forget to keep their eyes wet while wearing them. Wish more people were aware that some medications, drinking, and being dehydrated can mess with your eyesight/lenses.