The contact lens of claim 2, wherein said compound has the following general formula: ##STR60## wherein A and A' are selected from the group consisting of a C1 -C5 alkyl and D, and D is a group having the following general formula: ##STR61## wherein X and Y are selected from the group consisting of a C1 -C5 alkyl and Z2, and Z2 is a group having the following general formula: ##STR62## wherein B i