Evaluation of Normal Tear Volume and Intraocular Pressure in Saanen Goats at Different Periods

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  • Aylin Orhan
  • Zeynep Bozkan


Circadian, intraocular pressure, tear volume, saanen goat, season


This study was aimed to determine whether the reference values affected by different times of the day and season in Saanen Goats. One hundred twenty-two goats were included to this study and, tear secretion (TS) and intraocular pressure (IOP) were measured in three different time periods as morning, noon and evening on the same day in each seasonal group. Temperature and humidity values were recorded during all measurements. There was no difference between the right and left eyes in terms of IOP and TS (p>0.05). While mean TS value was significantly increased in the winter group (12.23±0.28 mm/min) compared with the spring (9.9±0.18 mm/min) and summer (9.14±0.19 mm/min) groups (p<0.001), mean IOP was significantly decreased in the winter group (14.05±0.28 mmHg) compared with the spring (17.64±0.36 mmHg) and summer (17.32±0.43 mmHg) groups (p<0.001). While mean TS value was significantly increased at noon (10.08±0.28 mm/min) compared with morning (10.99±0.24 mm/min) (p<0.001), mean IOP was significantly decreased in the morning (14.95±0.31 mmHg) compared to the afternoon (17.63±0.35 mmHg) and evening (16.54±0.42 mmHg) (p<0.001). In conclusion, TS and IOP values in Saanen goats are affected by different times of the day and season, and it will contribute to the literature by determining the values that can be taken as reference for these different daytime and seasonal profile of the IOP and TS in Saanen Goat.


Abrams KL, Brooks DE, Funk RS, Theran P. 1990 Evaluation of the Schirmer tear test in clinically normal rabbits. American Journal of Veterinary Research, 51: 1912-3.

Beech J, Zappala RA, Smith G, Lindborg S. 2003. Schirmer tear test results in normal horses and ponies: effect of age, season, environment, sex, time of day and placement of strips. Veterinary Ophthalmology, 6: 251–254.

Bertolucci C, Giudice E, Fazio F, Piccione G. 2009. Circadian intraocular pressure rhythms in athletic horses under different lighting regime. Chronobiology International, 26:348-358.

Broadwater, J.J., Schorling, J.J., Herring, I.P., Pickett, J.P., 2007. Ophthalmic examination findings in adult pygmy goats (Capra hircus). Vet Ophthalmol, 10:269-273.

Chae JJ, Jeong MB, Choi JS, Park S, Yi N, Kim WT, Seo KM. 2013. Seasonal Variations of Intraocular Pressure in Normal Sapsaree Dogs. Journal of Veterinary Clinics, 30: 95-99.

Crivelaro RM, Ribeiro AP, Teixeira PPM, Trujillo DY, Guimarães PJ, Laus JL. 2010. Effects of different mydriatics on intraocular pressure, pupil size, rumen and intestinal motility in the normal sheep. In Proc. Annual Scientific Meeting of the European College of Veterinary Ophthalmologists, Berlin, Germany, pp. 7.

Del Sole MJ, Sande PH, Bernades JM, Aba MA, Rosenstein RE. 2007. Circadian rhythm of intraocular pressure in cats. Veterinary Ophthalmology, 10:155-161.

Featherstone HJ, Heinrich CL. 2013. Ophthalmic Examination and Diagnostics, in: Gelatt KN, Gilger BC, Kern TJ, (Eds.), Veterinary Ophthalmology 5th Edn: Two Volume Set (). Oxford: Wiley-Blackwell, 533-702.

Ghaffari SM, Shojaei M, Sabzevari A, Khorami N. 2011. Reference values for intraocular pressure and schirmer tear test in clinically normal Sanjabi sheep. Small Ruminant Research, 97:101-103.

Giannetto, C., Piccione, G., Giudice, E., 2009. Daytime profile of the intraocular pressure and tear production in normal dog. Veterinary Ophthalmology, 12(5), 302–305.

Hamor RE, Roberts SM, Severin GA, Chavkin MJ. 2000. Evaluation of results for Schirmer tear tests conducted with and without application of a topical anesthetic in clinically normal dogs of 5 breeds. American Journal of Veterinary Research, 61: 1422–1425.

Hancox J, Murdoch I, Parmar D. 2002. Changes in intraocular pressure following diagnostic mydriasiswith cyclopentolate 1%. Eye, 16:562–566.

Pereira FQ, Bercht BS, Soares MG, da Mota MGB, Pigatto JAT. 2011. Comparison of a rebound and an applanation tonometer for measuring intraocular pressure in normal rabbits. Veterinary Ophthalmology, 14(5), 321-326.

Piccione G, Giannetto C, Fazio F, Assenza A, Caola G. 2009. Daily rhythm of tear production in normal dog maintained under different Light/Dark cycles. Research in Veterinary Science, 86:521-524.

Piccione G, Giannetto C, Fazio F, Giudice E. 2008. Daily rhythm of tear production in -normal horse. Veterinary Ophthalmology, 57-60.

Ribeiro AP, Piso DYT, Padua IRM, Silva ML, Laus JL. 2010. Intraocular pressure and tear secretion in Saanen goats with different ages. Pesquisa Veterinaria Brasileira, 30:798-802.

Rosolen, S.G., Multari, D., Woods, M., Jongh, O., 2009. Diagnostics In: Small Animal Ophthalmology, 4th Ed., RDC Group Ltd. Şti, China, pp. 2,15.

Stadtbaumer K, Frommlet F, Nell B. 2006. Effects of mydriatics on intraocular pressure and pupil size in the normal feline eye. Veterinary Ophthalmology, 9:233–237.

Stokkan KA, Folkow L, Dukes J, Neveu M, Hogg C, Siefken S, Dakin SC, Jeffery G. 2013. Shifting mirrors: adaptive changes in retinal reflections to winter darkness in Arctic reindeer. Royal Society, 280:20132451.

Trbolova A, Ghaffari MS. 2011. Reference values for Schirmer tear tests I and II in clinically normal pigs. Veterinary Ophthalmology, 1–3.




How to Cite

Orhan, A., & Bozkan, Z. (2022). Evaluation of Normal Tear Volume and Intraocular Pressure in Saanen Goats at Different Periods. International Journal of Veterinary and Animal Research (IJVAR), 5(3), 154–158. Retrieved from https://ijvar.org/index.php/ijvar/article/view/562



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