Minimising the risk of prion transmission by contact tonometry

Amin, S Z; Smith, Lorraine C; Luthert, Philip J.; Cheetham, Michael E.; Buckley, Roger

doi:10.1136/bjo.87.11.1360

Cited by 26 publications

(20 citation statements)

References 18 publications

(16 reference statements)

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“…Cleaning has been estimated to further reduce infectivity by four logs. 20,24,25 Virus contamination could not directly be examined in this study. Adenovirus infections, although generally self-limiting, remain a matter of concern.…”

Section: -23mentioning

confidence: 99%

Minimal cross-infection risk through Icare rebound tonometer probes: a useful tool for IOP-screenings in developing countries

Briesen

Schwering

Roberts³

et al. 2009

Eye

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Section: -23mentioning

confidence: 99%

Minimal cross-infection risk through Icare rebound tonometer probes: a useful tool for IOP-screenings in developing countries

Briesen

Schwering

Roberts³

et al. 2009

Eye

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“…15,16 However, relatively few studies have been conducted assessing the reliability of disposable tonometers, none yet featuring the Tonojet.…”

Section: Discussionmentioning

confidence: 99%

A comparison of clinical performance between disposable and Goldmann tonometers

Maino

Uddin

Tullo

2005

Eye

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Purpose Applanation tonometry as performed in routine clinical practice is a significant potential vehicle for cross-infection particularly in an emergency eye care setting. The aim of this study is to evaluate the accuracy and reliability of three single-use devices (Tonoshield, Tonosafe, Tonojet) as an alternative to standard Goldmann prisms in an emergency eye department.Methods All patients attending the eye casualty at the Manchester Royal Eye Hospital for a period of 4 months who required intraocular pressure measurement were eligible for this prospective study. Exclusion criteria were: age below 18 years, corneal anomalies that might affect measurement, and refusal to participate. After taking informed consent, the patient was examined by one experienced nurse practitioner, who measured the intraocular pressure three times. In the first part of the study, we compared the standard Goldmann prism vs Tonoshield and Tonosafe prisms, while for the second part of the study we used standard Goldmann, Tonosafe, and Tonojet prisms. Agreement and repeatability tests were carried out on separate samples. Results Tonosafe and Tonojet correlated well with standard Goldmann tonometry (Po0.001), while the measurements obtained with Tonoshield were higher, especially for raised intraocular pressure measurements. Tonojet and Tonosafe measurements were more reproducible than Tonoshield measurements.Conclusions This study shows that Tonosafe and Tonojet are accurate and reliable alternatives to standard Goldmann tonometry.

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“…5 Although there have been no documented cases of transmission of these via contaminated ophthalmic equipment, hepatitis B infection following exposure of the ocular surface to infectious material has been demonstrated in a primate. 6 More recently, corneal epithelial cells 7 and proteinaceous material 8 have been found to be retained on the tonometer head following decontaminaton of the prism using standard cleaning and disinfection regimes. This has been proposed as a potential source of CreutzfeldtJakob disease (CJD) transmission, the infectious agent being the prion protein.…”

Section: Introductionmentioning

confidence: 99%

Tonometer disinfection practice in the United Kingdom: A national survey

Hillier

Kumar

2007

Eye

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Purpose: To assess current tonometer disinfection practice in the UK, and compare with published recommendations. Methods: Every ophthalmology unit with training recognition in the UK was contacted (n ¼ 155). A senior nurse at each institution completed a telephone questionnaire regarding local tonometer disinfection practice. Results: The response rate was 100%. Thirty-five units (23%) reported exclusive use of disposable tonometer heads and were excluded from further analysis. One hundred and twenty units (77%) used either reusable or a combination of reusable and disposable tonometer heads. Where reusable heads were used, 80 units (67%) immersed them in a chlorine-based solution such as sodium hypochlorite or sodium dichloroisocyanurate.

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Minimising the risk of prion transmission by contact tonometry

Cited by 26 publications

References 18 publications

Minimal cross-infection risk through Icare rebound tonometer probes: a useful tool for IOP-screenings in developing countries

Minimal cross-infection risk through Icare rebound tonometer probes: a useful tool for IOP-screenings in developing countries

A comparison of clinical performance between disposable and Goldmann tonometers

Tonometer disinfection practice in the United Kingdom: A national survey

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