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The effect of iodine as a disinfectant on the Goldmann tonometry biprism

1 May 1990


With the isolation of the Acquired Immune Deficiency Syndrome virus (HIV) from the tears, the practitioner is more in need of effective disinfectants for Goldmann biprism. The current regimens suggested by the Centers for Disease Control for disinfection of the biprism includes a five minute soak in one of three disinfectants: 70 percent isopropyl alcohol, 0.5 percent bleach, or 3 percent hydrogen peroxide. However, some of these disinfectants damage the biprism . . An alternative choice for the practitioner would be the use of povidone-iodine (Betadine). Povidone-iodine is a broad spectrum disinfectant against active bacteria, fungi, and viruses including HIV. At this time Betadine has not been used as a disinfectant in Goldmann tonometry. In this study, we disinfected three Goldmann biprisms with isopropyl alcohol wipes and three Goldmann biprisms with povidone-iodine soaks. Six parameters were evaulated for each biprism: residue, integrity, color, surface, mires and lOP. The only effect of povidone-iodine was slight discoloration (yellowing) of the Goldmann biprism, but this did not alter lOP readings or damage the cornea. We recommend that povidone-iodine be approved as an alternative choice for disinfecting the Goldmann biprism.


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