Evaluation of Tear fluid secretion and Intraocular Pressure in normal ...

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sheep and Saanen goats, and assess the effect of topically applied atropine ... of two-four eye drops of atropine sulfate between 6 and 10 p.m for three.
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İŞLER (C. T.) AND COLLABORATORS

Evaluation of Tear fluid secretion and Intraocular Pressure in normal Merinos Sheep and Saanen Goats C. T. İŞLER1* , M. E. ALTUĞ1 , S. KILIÇ2

Mustafa Kemal University, Faculty of Veterinary Medicine, Department of Surgery, 31040, Hatay, TURKEY. Fırat University, Faculty of Veterinary Medicine, Department of Surgery, Elazığ, TURKEY.

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*Corresponding author : [email protected]

SUMMARY

RÉSUMÉ

This study aimed at determining the effects of the species, sex and age on normal tear secretion and intraocular pressure (IOP) in normal Merinos sheep and Saanen goats, and assess the effect of topically applied atropine on tear secretions in these species. The study used a total of 80 healthy Merinos sheep, Saanen goats, Merinos lambs and Saanen kids of 20 in each. The sheep and goat aged between 1-2.5 years and the lambs and kits between 15-20 days. The lambs and kits consisted of females and males of equal numbers. Tear secretion and intraocular pressure (IOP) were measured with Schirmer Tear Test (STT) and Schiotz Tonometry, respectively. All measurements were performed prior to and five minutes after the instillation of two-four eye drops of atropine sulfate between 6 and 10 p.m for three consecutive days. The present results demonstrated that with regard to tear secretion and IOP the differences between sheep and lambs, and that between goats and kids were statistically significant (p < 0.001) whereas the differences between the sheep and goats was non-significant ​​(p > 0.05). On the other hand, the values of tear secretion and IOP in the lambs and kids were significantly lower (p < 0.001) than those of sheep and goats. It was determined that sex variation did not significantly influence the IOP and STT values ​​(p > 0.05) but topical atropine administration significantly reduced tear volume (p < 0.001) in all cases.

Evaluation de la pression intraoculaire et de la quantité des larmes chez les moutons et les chèvres.

Keywords: Tear secretion, intraocular pressure (IOP), atropine, small ruminants.

Introduction Knowledge of normal reference ranges of intraocular pressure (IOP) and tear secretion are of importance for the diagnosis and treatment of ocular diseases such as keratitis, keratoconjunctivitis, anterior uveitis and glaucoma in domestic animals [8, 15, 17]. Lacrimal secretion prevents drying of the ocular surface and ensures to expel foreign materials from the eye [3]. Schirmer tear test (STT) is of critical importance in the diagnosis of corneal and conjunctival disorders and measures tear secretion using special paper strips [2]. STT measurements can be affected by individual performance, placement of the strips in the conjunctival sac and the diversities of paper strips [7, 16, 18]. IOP emerges as a result of the interaction between the fibrous layers of the eye and the secretion of the humor aqueous (HA). Depending on the balance between the secretion and the drainage of HA, IOP is maintained within certain physiologic ranges under normal circumstances. IOP

Ce travail vise à étudier les valeurs usuelles de la sécrétion lacrymale (SL) et de la pression intraoculaire (PIO) en fonction de l’espèce, du sexe et de l’âge chez le mouton Mérinos et la chèvre Saanen sain, ainsi que les effets d’une instillation d’atropine sur ces paramètres. Des échantillons de 20 moutons, chèvres, agneaux et cabris ont été utilisés,soit un total de 80 animaux . Les moutons et les chèvres étaient âgés de 1à 2,5 ans, et les cabris et les agneaux de 15 à 20 jours. Il y avait une répartition égale des mâles et des femelles parmi les cabris et les agneaux. La sécrétion lacrymale a été mesurée par le test de Schirmer et les valeurs de pression intraoculaire ont été évaluées avec le tonomètre de Schiotz. Toutes les mesures ont été faites pendant trois jours entre matin 06-10 heures avant l’instillationd’atropine et 5 minutes après. En conclusion, on a constaté que la différence entre les valeurs SL et PIO chez les moutons et agneaux, et chez les chèvres et cabris était significative (p0.05). D’autre part, on a trouvé que les valeurs SL et PIO chez les agneaux et les cabris étaient significativement inferieures que chez les moutons et les chèvres (p0,05) ; que l’atropine avait diminué significativement la sécrétion lacrymale chez tous les sujets(p