The invention relates to the use of an aqueous viscoelastic fluid for producing a medicinal product for the surgical treatment of the eye, which fluid produces an optical magnifying effect of the lens and the pupil upon application onto the surface of the eye from a single-dose receptacle. The viscoelastic fluid comprises at least one viscosity-increasing, physiologically acceptable polymer selected from the group consisting of hydroxypropylmethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hyaluronic acid, sodium alginate, hydroxylpropyl guar polyvinylpyrrolidone, polyvinyl alcohol, polymethacrylic acid (carbomer), polyoxyethylene polyoxypropylene copolymer (poloxamer) and polyethylene glycol, at a concentration of 0.01-30%.
