Can you tell me a suitable polymeric material used for hard contact lenses and why?

can you tell me a suitable polymeric material used for hard contact lenses and why? Also for %26quot;man-made%26quot; uppers for shoes or for a %26quot;heavy duty%26quot; domestic bath.





Thanks

Can you tell me a suitable polymeric material used for hard contact lenses and why?
%26quot;Hard%26quot; contact lenses are typically made out of polymethylmethacrylate (PMMA). This polymer is more rigid, that%26#039;s just a physical characteristic of methacrylate polymers. This contrasts with %26quot;soft%26quot; contact lenses, which are typically made out of hydroxyethylmethacrylate (HEMA).



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