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Related Experiment Videos

Contamination of disposable tonometer prisms during tonometry.

S N Rajak1, J Paul, V Sharma

  • 1Ophthalmology, Sussex Eye Hospital, Brighton, UK. saulrajak@hotmail.com

Eye (London, England)
|April 16, 2005
PubMed
Summary

Disposable tonometer prisms, used to prevent prion transmission, can still transmit bacteria and viruses. This study highlights potential infection risks for patients undergoing applanation tonometry.

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Area of Science:

  • Ophthalmology
  • Infectious Disease Transmission
  • Medical Device Safety

Background:

  • Applanation tonometry is crucial for measuring intraocular pressure.
  • Concerns exist regarding prion transmission via reusable tonometer prisms.
  • Disposable prisms are increasingly adopted in the UK to mitigate prion risks.

Purpose of the Study:

  • To investigate bacterial and viral transmission risks associated with disposable tonometer prisms.
  • To assess staff practices and perceptions regarding disposable prism use.
  • To evaluate the potential for pathogen transfer from healthcare practitioners to patients.

Main Methods:

  • Questionnaire distributed to staff performing applanation tonometry.
  • Bacterial cultures performed on handled disposable prisms.

Related Experiment Videos

  • In vitro model constructed to assess adenoviral transmission potential.

    • Main Results:

    • Nearly 50% of staff reported touching the prism's applanating face.
    • Bacterial contamination, including Staphylococcus and Bacillus species, was detected on prisms.
    • Adenovirus transmission via disposable prisms was deemed possible by the model.

    Conclusions:

    • Disposable prisms may not eliminate all infection risks associated with applanation tonometry.
    • Bacterial and viral contamination of disposable prisms poses a potential risk to patients.
    • Further measures may be needed to ensure the complete asepsis of tonometer prisms.