Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Experimental Assessment of the Spatial and Temporal Distribu-Tion of Non-contact Tonometer Airflows

Version 1 : Received: 25 January 2021 / Approved: 27 January 2021 / Online: 27 January 2021 (16:02:22 CET)

A peer-reviewed article of this Preprint also exists.

Oehring, D.; Jenkins, D.; Buckhurst, P.J.; Buckhurst, H. Experimental Assessment of the Spatial and Temporal Distribution of Non-Contact Tonometer Airflows. Appl. Sci. 2021, 11, 2499. Oehring, D.; Jenkins, D.; Buckhurst, P.J.; Buckhurst, H. Experimental Assessment of the Spatial and Temporal Distribution of Non-Contact Tonometer Airflows. Appl. Sci. 2021, 11, 2499.

Journal reference: Appl. Sci. 2021, 11, 2499
DOI: 10.3390/app11062499

Abstract

(1) Aim of the study was to investigate the spatial and temporal characteristics of the airflow created by two commercially available non-contact tonometers, the CorvisST and the Ocular Re-sponse Analyser. (2) The airflow pressure was measured using a MEMS pressure sensor to inves-tigate the spatial and temporal distribution. The airflow from the CorvisST and Ocular Response Analyser were mapped to a 600µm and a 1mm resolution grid, respectively. (3) Central airflow pressure of the CorvisST (96.4 ± 1.4)mmHg was higher than the Ocular Response Analyser (91.7 ± 0.7)mmHg. The duration of the air-puffs also differed, with the CorvisST showing a shorter du-ration (21.483 ± 0.2881)ms than the ORA (23.061 ± 0.1872)ms. The rising edge of the CorvisST airflow pressure profile demonstrated a lower gradient (+8.94mmHg/ms) compared to the Oc-ular Response Analyser (+11.00mmHg/ms). Both had similar decay response edges; CorvisST -11.18mmHg/ms, Ocular Response Analyser -11.65mmHg/ms. (4) The study presents a valid method to investigate physical dimensions of the airflow pressure of non-contact tonometers. Novel findings relating to the magnitude, duration and spatial characteristics of the respective airflow pressures are reported. It is anticipated that this information will better inform clinical studies and theoretical models relating to ocular biomechanics.

Subject Areas

Air puff, CorvisST; ORA; Airflow pressure of NCT,; Physical dimension of jet stream; Temporal and spatial distribution of the air puff

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