Polymeric ophthalmic lens with crosslinker containing saccharide residue

A crosslinked polymer comprising the reaction product of a hydrophilic monomer and a crosslinking amount of a polyfunctional compound having the following formula:

• ›S--(A).sub.n !.sub.y
• wherein
• S is the residue of a five or six membered saccharide ring;
• A=--(CH.sub.2).sub.b --O--R.sub.2 --(R.sub.3).sub.c --(R.sub.4).sub.t --(CONH--R.sub.5).sub.u
• n is between 2 and 4, inclusive;
• y is between 1 and 4, inclusive;
• b is 0 or 1;
• provided that for at least one A, b is 1;
• c is 0 or 1;
• R.sub.2 =--(CH.sub.2 CHR.sub.6 O).sub.x --;
• R.sub.6 is hydrogen or methyl;
• x is between 8 and 250, inclusive;
• R.sub.3 =--CONH--R.sub.7 --NHOC--
• R.sub.7 is a divalent radical which is a residue of either isophorone diisocyanate or toluene diisocyanate;
• R.sub.4 =X.sub.1 --(CH.sub.2 (CHR.sub.6).sub.a X).sub.z CH.sub.2 (CHR.sub.6).sub.a X when c is 1 and u is 1, or alternatively,
• R.sub.4 =O--R.sub.8 when u=0;
• t=0 or 1;
• x.sub.1 =O or NH;
• X=O or NH;
• a is between 0 and 3, inclusive;
• z is between 10 and 180, inclusive;
• R.sub.8 =--(CHR.sub.6 CH.sub.2 O).sub.f (CH.sub.2).sub.c (C(R.sub.9).sub.2).sub.d C(R.sub.9).sub.3 ;
• R.sub.9 =H or F;
• d is between 0 and 30, inclusive;
• e is between 1 and 69, inclusive;
• f is between 0 and 50, inclusive;
• u is 0 or 1, provided that u is 1 for at least one A per y;
• R.sub.5 is a free radical reactive end group.