Pinhole lenses - plates are used for the manufacture of training glasses or stenopeic glasses - this is a frame made of plastic or metal with plates inserted in it instead of the usual lenses, which are made of opaque plastic. Small cylindrical or cone-shaped holes made in a certain order are located in the plates.
These glasses are recommended for the following purposes: for relaxation in the event that your eyes are subject to intense stress; in order to temporarily correct vision, if you have one or another eye disease.