Time course of changes in tear meniscus radius and blink rate after instillation of artificial tears

Bandlitz, Stefan, Purslow, Christine, Murphy, Paul J. and Pult, Heiko ORCID: https://orcid.org/0000-0003-4371-8007 2014. Time course of changes in tear meniscus radius and blink rate after instillation of artificial tears. Investigative Ophthalmology and Visual Science 55 (9) , pp. 5842-5847. 10.1167/iovs.14-14844.

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Abstract

PURPOSE: Using a novel digital meniscometer (PDM), alterations in tear meniscus radius (TMR) were measured simultaneously with blink rate (BR) following the instillation of artificial tears. METHODS: Central TMR and BR of 22 subjects (11 male and 11 female; mean age, 24.3 ± 2.6 SD years) were measured at baseline, and 0, 1, 5, 10, and 30 minutes after instillation of an artificial tear containing hydroxypropyl-guar and glycol (SYS) or saline (SAL). A dose of 35 μL was applied in one eye in a randomized order with a washout period between each drop. RESULTS: For SAL, compared to baseline TMR (0.33 ± 0.08 mm), TMR significantly increased with drop instillation (1.55 ± 0.69 mm) and at 1 minute (0.66 ± 0.36 mm; P < 0.05), but returned to baseline after 5 minutes. For SYS, TMR (0.32 ± 0.07 mm) remained significantly increased after application (1.62 ± 0.81 mm), and at 1 minute (0.81 ± 0.43 mm) and 5 minutes (0.39 ± 0.08 mm; P < 0.05). Compared to baseline BR with SAL (14.8 ± 7.7) and SYS (14.9 ± 9.4), values were significantly increased upon drop instillation (22.5 ± 11.8; 21.3 ± 11.8; P < 0.05), but returned to baseline after 1 minute. Dry eye symptoms were correlated with baseline BR (r = 0.550, P = 0.008). CONCLUSIONS: Results indicate that PDM can detect changes in TMR following instillation of artificial tears. Difference in residence time reflects the different viscosity of each drop. An overload with a large drop may result in an initially increased BR.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Optometry and Vision Sciences
Subjects:	R Medicine > RE Ophthalmology
Uncontrolled Keywords:	artificial tears; blink rate; dry eye symptoms; portable digital meniscometer; tear meniscus; tear volume loss
Publisher:	Association for Research in Vision and Ophthalmology
ISSN:	0146-0404
Last Modified:	01 Nov 2022 09:23
URI:	https://orca.cardiff.ac.uk/id/eprint/87803

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