June 2021
Volume 62, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2021
Perimeter bowl disinfection during the COVID-19 pandemic
Author Affiliations & Notes
  • Kique Romero
    Carl Zeiss Meditec Inc, Dublin, California, United States
  • Robert Bourque
    Carl Zeiss Meditec Inc, Dublin, California, United States
  • Thomas Callan
    Carl Zeiss Meditec Inc, Dublin, California, United States
  • Katharina G Foote
    Carl Zeiss Meditec Inc, Dublin, California, United States
  • Eric Larson
    Carl Zeiss Meditec Inc, Dublin, California, United States
  • Robert Sprowl
    Carl Zeiss Meditec Inc, Dublin, California, United States
  • Ashwini Tamhakar
    Carl Zeiss Meditec Inc, Dublin, California, United States
  • Brad Gilbertson
    Carl Zeiss Meditec Inc, Dublin, California, United States
  • Footnotes
    Commercial Relationships   Kique Romero, Carl Zeiss Meditec, Inc. (E); Robert Bourque, Carl Zeiss Meditec, Inc. (E); Thomas Callan, Carl Zeiss Meditec, Inc. (E); Katharina Foote, Carl Zeiss Meditec, Inc. (E); Eric Larson, Carl Zeiss Meditec, Inc. (E); Robert Sprowl, Carl Zeiss Meditec, Inc. (E); Ashwini Tamhakar, Carl Zeiss Meditec, Inc. (E); Brad Gilbertson, Carl Zeiss Meditec, Inc. (E)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2021, Vol.62, 1747. doi:
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      Kique Romero, Robert Bourque, Thomas Callan, Katharina G Foote, Eric Larson, Robert Sprowl, Ashwini Tamhakar, Brad Gilbertson; Perimeter bowl disinfection during the COVID-19 pandemic. Invest. Ophthalmol. Vis. Sci. 2021;62(8):1747.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Automated bowl perimeters present unique challenges for disinfection between patients during the SARS-CoV-2 (COVID-19) pandemic. International public health guidelines recommend the use of 70% isopropyl alcohol (IPA) or Ultraviolet-C light (UV-C) for disinfection. In this study we evaluated the effect of repeated exposure on the visual field stimulus in Humphrey Field Analyzers.

Methods : We subjected perimeter bowls (HFA3 Model 860, ZEISS, Dublin, CA and HFATM II-i, ZEISS, Dublin, CA) to highly accelerated life tests (HALT) for exposure to IPA or UV-C. For IPA, the device was sanitized with an IPA atomizing spray 15 times, followed by an 84hr IPA deep soak of components integral to the stimulus. For UV-C (Figure 1), materials of concern were irradiated with a 254nm light for a cumulative lifetime exposure of 22.8 kJ/cm2. This represents an excess of 75,000 disinfection cycles at above the 1-Log Reduction (D90) dose for COVID-19. The effect on the visual field stimulus (combination of projected stimulus and background illumination) was evaluated either by auto verifying that the correct luminance values were recorded at calibrated positions on the instrument or by manually measuring the chromaticity and luminance of the bowl.

Results : Automatic verification tests on an HFA3 after exposure, showed that the instrument was within tolerance with a reading error spread less than 1dB for an attenuation range of 0-34dB (Table 1). UV-C exposure to the HFA II-i bowl itself resulted in a shift of less than 0.002 in chromaticity and 18fL in luminance. Other plastics (chin rest, cover, and baffle) were visibly affected by UV-C and exhibited a shift in chromaticity (> 0.02) and luminance (> 114fL) but this did not affect the visual field stimulus.

Conclusions : There was no effect on the visual field stimulus in an HFA3 or an HFA II-i after repeated exposure to 70% IPA or UV-C at 254nm for the lifetime of the instrument. There was visible solarization on some plastics, however these did not affect the test performance; they were either outside the bowl or were compensated by the stimulus intensity.

This is a 2021 ARVO Annual Meeting abstract.

 

Figure 1: UV-C test setup examples; (a) bowl, (b) yellow filter and background illumination lamp

Figure 1: UV-C test setup examples; (a) bowl, (b) yellow filter and background illumination lamp

 

Table 1: Automatic and manual verification results for chromaticity and luminance

Table 1: Automatic and manual verification results for chromaticity and luminance

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