EXPERIENCE with iontophoresis goes back to the end of the last century. In recent years, sodium sulfathiazole1 and a number of other substances2 have been recommended as therapeutic agents. The procedure, however, has been much more widely discussed since the introduction of penicillin3 led to spectacular results.
The electrodes used in iontophoresis range from a medicated piece of cotton, placed between a small metal plate and the eye, to a cylindric glass tube, adapted to fit the shape of the cornea. Sometimes a plain probe is employed, such as Hamberger's electrode, consisting of a piece of cotton, which has been saturated with the medicinal solution, wrapped around the end of a thin carbon rod.4
All these types of electrodes must be held in position by the operator throughout the treatment, since they are not so devised that they will stay in place unsupported. Furthermore, they are
TOWER P. CONTACT LENS ELECTRODE FOR IONTOPHORESIS. Arch Ophthalmol. 1949;41(6):730-733. doi:10.1001/archopht.1949.00900040749007