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lenses direct are classified into three basic types according to their chemical composition and physical properties. these are hard, soft and rigid gas permeable. soft lenses are further classified into daily wear, extended wear, and disposable lenses.hard lenses. hard lenses are hydrophobic and rigid. chemically, these lenses are polymerized products of esters of acrylic acid or methacrylic acid. the most common plastic employed in hard contact lenses is polymethyl-methacrylate (pmma), a rigid plastic resin with the advantages of being transparent, physiologically safe, stable and lenses having a surface wettability about the same as the cornea. it is essentially impermeable to moisture and oxygen, direct though typically absorbing only about 0.5 percent water.

lenses direct are classified into three basic types according to their chemical composition and physical properties. these are hard, soft and rigid gas permeable. soft lenses are further classified into daily wear, extended wear, and disposable lenses.hard lenses. hard lenses are hydrophobic and rigid. chemically, these lenses are polymerized products of esters of acrylic acid or methacrylic acid. the most common plastic employed in hard contact lenses is polymethyl-methacrylate (pmma), a rigid plastic resin with the advantages of being transparent, physiologically safe, stable and lenses having a surface wettability about the same as the cornea. it is essentially impermeable to moisture and oxygen, direct though typically absorbing only about 0.5 percent water.

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