Is it safe to wear non-prescription contacts?

[Linndale]

Guys, is it safe to wear non-prescription contacts?I need some advice.

[Micaville]

I think it is not safe to wear this kind of contacts. Contacts can damage our eyes though its side effects. cannot be found in one day, while the problems do exist. We cannot ignore them. If you do not have vision problems, you are so lucky. Why not keep the good vision ability? And protect your eyes with caution.