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Online Journal of Veterinary Research©

(Including Medical and Laboratory Research)

Established 1994
ISSN 1328-925X


Volume 26 (8): 620-625, 2022.

 Meniscus height and Schirmer tear tests in brachycephalic dogs

Paulo Henrique Sampaio da Silva* (DVM), Layla Karolaynne Souza Cruz (DVM),

Brendha Mendes Ferreira (DVM), Mário Sérgio Almeida Falcão (DVM, PhD)

¹Veterinary Center of Vision, Cond. San Diego, lt 385, Jardim Botanico, Brasília, Brazil.




Silva PHS, Cruz LKS, Ferreira BM, Falcão MSA., Meniscus height and schirmer tear tests in brachycephalic dogs,  Onl J Vet Res., 26 (8): 620-625, 2022. Muco aqueous tear film layer, is essential for function of ocular surface. Function can be evaluated by Schirmer tear, strip meniscometry and tear meniscus height tests with ocular surface analysis. Twelve healthy female and 6 male Shihtzu dogs aged 4.7 ± 3.9 years accounting for 36 eyes were examined. Mean meniscus tear tests were 0.74 ± 0.32 mm (CI 95% 0.63:0.84) whereas Schirmers were 21.08 ± 5.19 mm/min (CI 95% 19.33:22.84). For right eye meniscus values were 0.59 ± 0.29 mm (CI 95% 0.45: 0.74) and Schirmer 19.06 ± 4.87 (CI 95% 16.63:21.48) whereas left one 0.88 ± 0.28 mm (CI 95% 0,74:1,02) and 23.11 ± 4.80 mm/min (CI 95% 20,72:25.50).  By unpaired t-test we found difference for both tests (P < 0.0046 - 0.0167)) between eyes. Both (r = 0.421; p = 0.011) correlated by Pearson tests. We find that tear meniscus height can accurately measure tear production in brachyocerphalic dogs. More studies are necessary to evaluate if there is a difference between the height of the meniscus of brachycephalic and non-brachycephalic dogs.


Keywords: surface, eye, meniscus, aqueous, ophthalmology