About VISMED & Dry Eyes Vismed Gel 20 x 0.45ml VISMED Gel's higher concentrations of sodium hyaluronate stay on the eye for longer, & will therefore increase the thickness & stability of the tear film. VISMED Gel also contains essential ions & supplies the tissue with moisture. VISMED Gel feels silky on the eye & needs to be applied less frequently. VISMED Gel is presented in boxes of 20 single-dose vials which guarantee a simple dosage. It is preservative-free.