Abstract
<h3>Introduction</h3> Proper tonometer care and sterilization are of utmost importance to every clinician. In order to function efficiently, the plunger, as well as the channel in which it moves, must be clean and free of ocular secretions which tend to line the plunger by capillarity. Sterilization of only the footplate and the inferior end of the plunger is not sufficient to eliminate the danger of cross infection.<sup>1</sup>Pathogens picked up from an infected eye and lodged in the interior of the instrument are likely to enter subsequent eyes on which the instrument is used, particularly as secretions from uninfected eyes dislodge the pathogens. Dr. Ronald Wood reviewed the numerous chemical and physical agents available for tonometer sterilization. None of these was found to be both reliable and practical for office or clinic practice. However, a thin latex membrane, called a Tonofilm, was developed as a physical barrier for use during
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