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Assessment of temporal and spatial distribution patterns of aerosol produced by air-puff non-contact tonometer.
Chen, Xuhao; Li, Bingzhen; Zhang, Chun.
  • Chen X; Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.
  • Li B; Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, 66482Peking University Third Hospital, Beijing, China.
  • Zhang C; Department of Ophthalmology, 66482Peking University Third Hospital, Beijing, China.
Eur J Ophthalmol ; 32(5): 3012-3018, 2022 Sep.
Article in English | MEDLINE | ID: covidwho-1551160
ABSTRACT

PURPOSE:

To assess the distribution pattern of aerosol in the aspect of time and direction during the intraocular pressure (IOP) measurement by air-puff non-contact tonometer (NCT) and further offer references for protection from coronavirus disease-19 (COVID-19) in the routine ophthalmic examination.

METHOD:

A single-center observational study was conducted in the ophthalmology clinics of Peking University Third Hospital. Two air quality detectors were equipped to assess the generated particulate matter (PM) concentration simultaneously within 30 s after IOP measurement in the outpatient hall. Detector A was fixed next to the NCT as a reference, while Detector B was fixed 1 meter away. The participants were divided into two groups depending on the position of Detector B. The generation of aerosol was compared within different groups and time intervals.

RESULTS:

144 participants were enrolled in the final analysis. At a 1 m distance from the NCT, the PM2.5 concentration significantly increased at the 30 s (Z = 2.898, Bonferroni-corrected P = 0.038) while the PM10 concentration increased immediately after the IOP measurement (Z = 2.967, Bonferroni-corrected P = 0.030). The PM2.5 and PM10 concentrations at 1 m were significantly higher immediately (Z = -2.183, P = 0.029; Z = -2.502, P = 0.012) and 30 s (Z = -2.021, P = 0.043; Z = -2.071, P = 0.038) after the IOP measurements when the Detector B was vertical to the air jet on the lateral side.

CONCLUSIONS:

NCT may produce aerosol after the IOP measurement by air-puff. The generated PM2.5 had a prolonged existence compared with PM10 at a 1 m distance. The lateral side of the air-puff direction may be of higher exposure risk to aerosol.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Tonometry, Ocular / COVID-19 Type of study: Experimental Studies / Observational study / Prognostic study / Randomized controlled trials Limits: Humans Language: English Journal: Eur J Ophthalmol Journal subject: Ophthalmology Year: 2022 Document Type: Article Affiliation country: 11206721211054727

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Tonometry, Ocular / COVID-19 Type of study: Experimental Studies / Observational study / Prognostic study / Randomized controlled trials Limits: Humans Language: English Journal: Eur J Ophthalmol Journal subject: Ophthalmology Year: 2022 Document Type: Article Affiliation country: 11206721211054727