METHOD OF SOFT CONTACT LENS MAKING Russian patent published in 1998 - IPC

FIELD: medicine, ophthalmology. SUBSTANCE: invention relates to making soft contact lens based on hydrophilic polyacrylamide gel. Method involves polymerization of acrylamide and cross-linking agent aqueous solutions in the presence of alkaline metal persulfate and N,N,N',N'-tetramethylethylenediamine at 20-25 C followed by washing out the obtained lens in distilled water. Cross-linking agent is a compound of the general formula given in invention description. The parent components for polymerization were taken at the following ratio, wt.-%: acrylamide 25-60; cross-linking agent 0.07-1.20; potassium or sodium persulfate 0.05-0.40; N,N,N',N'-tetramethylethylenediamine 0.08-0.30, and distilled water - the rest. EFFECT: improved method of lens making. 15 tbl