| abstract |
Acrylic siloxanes having the formula: <IMAGE> where R1 is selected from the class of hydrogen or methyl groups, "a" is an integer from one to five, "b" is an integer from zero to seven, "c" is an integer from zero to two, "d" is an integer from zero to one, A is selected from the class of methyl or phenyl groups, R2 is selected from the class of methyl or phenyl groups, R3 and R4 represent either no group (cyclic ring from "c" to "d") or methyl or phenyl groups, act synergistically with vinyl pyrrolidone and hydroxy ethyl methacrylate to provide optically clear moderate water containing contact lenses of substantially increased oxygen permeability. |