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Proposal of a new slit-lamp shield for ophthalmic examination and assessment of its effectiveness using computational simulations

Ferraz, Daniel Araújo; Guan, Zeyu; Costa, Edinilson A; Martins, Eduardo; Keane, Pearse A; Ting, Daniel Shu Wei; Belfort, Rubens; ... Muccioli, Cristina; + view all (2022) Proposal of a new slit-lamp shield for ophthalmic examination and assessment of its effectiveness using computational simulations. Arquivos Brasileiros de Oftalmologia , 86 (4) 10.5935/0004-2749.20230058. (In press). Green open access

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Abstract

PURPOSE: This study aimed to use computational models for simulating the movement of respiratory droplets when assessing the efficacy of standard slit-lamp shield versus a new shield designed for increased clinician comfort as well as adequate protection. METHODS: Simulations were performed using the commercial software Star-CCM+. Respiratory droplets were assumed to be 100% water in volume fraction with particle diameter distribution represented by a geometric mean of 74.4 (±1.5 standard deviation) μm over a 4-min duration. The total mass of respiratory droplets expelled from patients' mouths and droplet accumulation on the manikin were measured under the following three conditions: with no slit-lamp shield, using the standard slit-lamp shield, and using our new proposed shield. RESULTS: The total accumulated water droplet mass (kilogram) and percentage of expelled mass accumulated on the shield under the three aforementioned conditions were as follows: 5.84e-10 kg (28% of the total weight of particle emitted that settled on the manikin), 9.14e-13 kg (0.045%), and 3.19e-13 (0.015%), respectively. The standard shield could shield off 99.83% of the particles that would otherwise be deposited on the manikin, which is comparable to 99.95% for the proposed design. Conclusion: Slit-lamp shields are effective infection control tools against respiratory droplets. The proposed shield showed comparable effectiveness compared with conventional slit-lamp shields, but with potentially enhanced ergonomics for ophthalmologists during slit-lamp examinations.

Type: Article
Title: Proposal of a new slit-lamp shield for ophthalmic examination and assessment of its effectiveness using computational simulations
Location: Brazil
Open access status: An open access version is available from UCL Discovery
DOI: 10.5935/0004-2749.20230058
Publisher version: http://dx.doi.org/10.5935/0004-2749.20230058
Language: English
Additional information: This content is licensed under a Creative Commons Attributions 4.0 International License.
UCL classification: UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10149043
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