originally, darth hard contact were made of a material called pmma. although still available, the more common types of contact are listed below:rigid gas-permeable (rgp) daily-wear lenses are made contact of plastic that does not absorb water lenses but allows oxygen to get from the atmosphere sfx to the cornea. (this is important because the cornea has no blood supply and needs to get its oxygen from the atmosphere through the film of theatrical tears that moves beneath the lens.) they must be removed and cleaned each night. rigid gas-permeable (rgp) extended-wear lenses are made from plastic that also does not absorb water but is more permeable darth to oxygen than the plastic used for daily-wear lenses.

originally, darth hard contact were made of a material called pmma. although still available, the more common types of contact are listed below:rigid gas-permeable (rgp) daily-wear lenses are made contact of plastic that does not absorb water lenses but allows oxygen to get from the atmosphere sfx to the cornea. (this is important because the cornea has no blood supply and needs to get its oxygen from the atmosphere through the film of theatrical tears that moves beneath the lens.) they must be removed and cleaned each night. rigid gas-permeable (rgp) extended-wear lenses are made from plastic that also does not absorb water but is more permeable darth to oxygen than the plastic used for daily-wear lenses.