<prompt> Soft contact lens is made up ofPMMAHEMAGlassSilicone  <response>: B i.e. HEMA Types of Contact Lens Hard Gas permeable Rigid or semisoft Soft Made of PMMA poly methyl metha acrylate Q Copolymer of PMMA, silicon containing vinyl monomer and cellulose acetate butyrate CAB HEMA hydro? xy methyl metha acrylate Q Oxygen delivery Poor Moderate to high High Deposits Few Few More Visual clarity Good Clear Need to refocus after a blink Use in astigmatism Possible Possible Less suitable Adaptation Required Required Not required Durability May scratch Do not scratch or tear Tear 