Hydrophilic treatment method of the contact lens liquid agent and contact lenses using the same

Providing a liquid formulation for contact lenses which can also have stable hydrophilic with respect to the surface of the strong contact lens water repellency. And N-p-vinylbenzyl -D- lactone amide, a copolymer comprising copolymerizable therewith at least one monomer, the contact lens liquid agent containing at a rate of 0.0001~5w / v% preparation did.