The effect of elevated progesterone levels on intraocular pressure in lions (Panthera leo)

Ofri, Ron; Shore, Laurence S.; Kass, Philip H.; Horowitz, Igal

doi:10.1053/rvsc.1998.0300

Cited by 42 publications

(64 citation statements)

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“…Three of these species, the Arabian oryx (Oryx leucoryx) and Nubian ibex (Capra ibex nubiana) (Ofri et al, 1999a) as well as the Asian fallow deer (present report) are desert-dwelling species, with mean STT values of 12.7, 13.2 and 10.5 mm/min, respectively. The Burchell's zebra (Ofri et al, 1999a), Thomson gazelle (R. Ofri, unpubl. data) and eland (present report), have mean STT values of 23.4, 21.0 and 18.7 mm/min, respectively.…”

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confidence: 58%

“…Other members of the Bovidae family, to which the eland belongs, have significantly lower IOP than the deer. In gazelles, we measured a mean IOP of 7.6 mm Hg (Ofri et al, 2000), significantly lower than that of the deer (P Ͻ 0.001). The range of IOP that we recorded in the Bovidae family, from 7.6 mm Hg in gazelles to 14.6 mm Hg in juvenile eland, reinforces the point raised earlier.…”

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confidence: 68%

“…Large inter-species variations in reference IOP and STT values have been documented. For example, normal IOP may range from 7.6 mm Hg in the Thomson gazelle (Gazella thomsoni) (Ofri et al, 2000) to 29.5 mm Hg in Burchell's zebra (Equus burchelli) (Ofri et al, 1998a). Thus, what would constitute a normal reading in the zebra will be diagnosed as glaucoma in the gazelle.…”

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confidence: 99%

“…In addition, it is not possible to extrapolate normal values from closely-related species. Normal tear production in Felidae ranges from 17.0 mm/min in the domestic cat (Veith et al, 1970) to 24.4 mm/min in the African lion (Panthera leo) (Ofri et al, 1997). Therefore, in order to improve the veterinary care of captive wild animals, and to further our understanding of comparative ocular physiology, it is necessary to determine normal reference values for each species.…”

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confidence: 99%

“…Therefore, in order to improve the veterinary care of captive wild animals, and to further our understanding of comparative ocular physiology, it is necessary to determine normal reference values for each species. During the last few years we have evaluated IOP and tear production, and the effect of chemical restraint thereon, in a number of captive wildlife species (Ofri et al, 1997;Ofri et al, 1998aOfri et al, , b, 1999aOfri et al, , b, 2000. The aim of this study was to determine baseline IOP and STT values in two wild ruminant species that have not been studied.…”

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confidence: 99%

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Intraocular Pressure and Tear Production in Captive Eland and Fallow Deer

Ofri

Horowitz

Levison³

et al. 2001

Journal of Wildlife Diseases

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Applanation tonometry was used to estimate intraocular pressure (IOP) and Schirmer tear test (STT) I was used to estimate tear production in both eyes of 12 juvenile elands (Taurotragus oryx) and one eye each of 15 Asian fallow deer (Dama mesopotamica). Mean (Ϯ standard deviation) IOP was 14.6 Ϯ 4.0 mm Hg in the eland and 11.9 Ϯ 3.3 mm Hg in the deer. Mean tear production was 18.7 Ϯ 5.9 mm/min in the eland and 10.5 Ϯ 6.5 mm/ min in the deer. The large variation in IOP between two members of the family Bovidae, the elands reported here and the Thomson gazelle (Gazella thomsoni) for which we previously reported a mean pressure of 7.6 mm Hg, illustrates the need to establish reference values for each species. Tear production may be influenced by the species' natural habitat.

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confidence: 68%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Intraocular Pressure and Tear Production in Captive Eland and Fallow Deer

Ofri

Horowitz

Levison³

et al. 2001

Journal of Wildlife Diseases

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The Effects of Pregnancy Status on Lacrimal Caruncle Temperature, Intraocular Pressure and Rectal Temperature in Cats: A Preliminary Study

Ozcan,

Safak,

Dellalbasi

et al. 2024

Veterinary Medicine & Sci

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ObjectiveThe objectives of this study were to compare the body temperatures between pregnant and nonpregnant cats from two sites, lacrimal caruncle temperature (LCT) and rectal temperature (RT), and to compare intraocular pressure (IOP) between pregnant and nonpregnant cats.Animal studiedThis study was performed on 13 pregnant and 16 anoestrous cats.ProceduresThe gestation period of the pregnant cats ranged from 20 to 45 days. A vaginal smear was also performed to determine the sexual cycles of nonpregnant cats. The IOP was measured using a rebound tonometer.ResultsThe pregnant cats (38 ± 0.7°C) exhibited a lower RT than the nonpregnant cats (38.5 ± 0.5°C) (p < 0.05). No significant differences existed between the pregnant and nonpregnant groups in the right (R)‐LCT or left (L)‐LCT (p > 0.05). The average LCT temperature measured 32.30 ± 2.23°C in cats. The right (R)‐IOP in pregnant cats (17.69 ± 5.6 mm Hg) was significantly lower than in nonpregnant cats (22.37 ± 5.27 mm Hg) (p < 0.029). Pregnant cats exhibited a significantly lower left (L)‐IOP value (17.69 ± 5.76 mm Hg) compared to nonpregnant cats (23.18 ± 5.55 mm Hg) (p < 0.015).ConclusionThis study presents a preliminary report that documents a noteworthy reduction in RT in pregnant cats (38 ± 0.7°C) as compared to cats in anoestrus. Pregnancy also has an effect on the IOP. It was hypothesised that the hormonal changes induced by pregnancy in cats would have a substantial impact on IOP and RT. Although body temperature can be measured using LCT, RT should still be utilised as the reference measurement site.

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