Sno Tears 10ml Sno tears eye drops contain the active ingredient polyvinyl alcohol, which is a type of medicine known as an eye lubricant. It is used for the treatment of the symptoms of dry eye caused by your eye not producing enough tears to keep the eye wet. Sno Tears works by decreasing the surface tension of the tears so that they spread more easily over the surface of the eye & don't break into dry spots. It also has properties similar to the natural mucin produced by the conjunctiva, which soothes & lubricates the eye & enhances the stability of the tear film. Snotears is also used as an ocular lubricant for artificial eyes.