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Evaluation of the Perkins handheld applanation tonometer in horses and cattle.

Andrade SF, Kupper DS, Pinho LF, Franco EC, Prataviera MV, Duarte RR, Junqueira JR - J. Vet. Sci. (2011)

Bottom Line: IOP was measured postmortem using direct manometry (measured with an aneroid manometer) and tonometry (measured with a Perkins handheld applanation tonometer).In cattle, IOP was found to be 19.7 ± 1.2 mmHg (range 18.0~22.0 mmHg) by manometry and 18.8 ± 1.7 mmHg (range 15.9~20.8 mmHg) by tonometry.Our results demonstrate that the Perkins handheld tonometer could be an additional tool for accurately measuring IOP in equine and bovine eyes.

View Article: PubMed Central - PubMed

Affiliation: Department of Small Animal Medicine, University of Oeste Paulista, Rodovia Raposo Tavares, km 572, CEP 19001-970, Presidente Prudente, Brazil. silviafranco@unoeste.br

ABSTRACT
The objective of this study was to evaluate and validate the accuracy of the Perkins handheld applanation tonometer for measuring intraocular pressure (IOP) in horses and cattle. Both eyes of 10 adult horses and cattle were evaluated in a postmortem study. The eyes from 10 clinically normal adult horses and cattle were also examined after bilateral auriculopalpebral nerve block and topical anesthesia for an in vivo study. IOP was measured postmortem using direct manometry (measured with an aneroid manometer) and tonometry (measured with a Perkins handheld applanation tonometer). The correlation coefficients (r(2)) for the data from the postmortem manometry and Perkins tonometer study were 0.866 for horses and 0.864 for cattle. In the in vivo study, IOP in horses was 25.1 ± 2.9 mmHg (range 19.0~30.0 mmHg) as measured by manometry and 23.4 ± 3.2 mmHg (range 18.6~28.4 mmHg) according to tonometry. In cattle, IOP was found to be 19.7 ± 1.2 mmHg (range 18.0~22.0 mmHg) by manometry and 18.8 ± 1.7 mmHg (range 15.9~20.8 mmHg) by tonometry. There was a strong correlation between the IOP values obtained by direct ocular manometry and the tonometer in both horses and cattle. Our results demonstrate that the Perkins handheld tonometer could be an additional tool for accurately measuring IOP in equine and bovine eyes.

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Regression lines of IOP values from the Perkins applanation tonometer vs. ones from direct postmortem ocular manometry for the eyes of (A) horses (n = 10) and (B) cattle (n = 10).
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Figure 4: Regression lines of IOP values from the Perkins applanation tonometer vs. ones from direct postmortem ocular manometry for the eyes of (A) horses (n = 10) and (B) cattle (n = 10).

Mentions: The correlation coefficients (r2) between the data from manometry and the Perkins tonometer were 0.866 in horses and 0.864 in cattle. For the postmortem study, the corresponding linear regression was y = 0.082x + 0.268 for horses, and y = 0.082 + 0.290 for cattle (Fig. 4). In the in vivo study, the IOP values measured by the manometer were 25.1 ± 2.9 mmHg (range, 19.0~30.0 mmHg) in horses (Table 1) and 19.7 ± 1.2 mmHg (range, 18.0~22.0) in cattle (Table 2). In the in vivo study, the mean IOP measured by the Perkins tonometer was 2.2 ± 0.3 (range 1.8~2.6 mmHg) in horses. This value corresponded to 23.4 ± 3.2 mmHg (range, 18.6~28.4 mmHg) according to our calibration curve (Table 1). In cattle (Table 2), the mean IOP measured by the Perkins tonometer was 1.8 ± 0.1 (range 1.6~2.0 mmHg) and corresponded to 18.8 ± 1.7 mmHg (range 15.9~20.8 mmHg) according to our calibration curve.


Evaluation of the Perkins handheld applanation tonometer in horses and cattle.

Andrade SF, Kupper DS, Pinho LF, Franco EC, Prataviera MV, Duarte RR, Junqueira JR - J. Vet. Sci. (2011)

Regression lines of IOP values from the Perkins applanation tonometer vs. ones from direct postmortem ocular manometry for the eyes of (A) horses (n = 10) and (B) cattle (n = 10).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3104172&req=5

Figure 4: Regression lines of IOP values from the Perkins applanation tonometer vs. ones from direct postmortem ocular manometry for the eyes of (A) horses (n = 10) and (B) cattle (n = 10).
Mentions: The correlation coefficients (r2) between the data from manometry and the Perkins tonometer were 0.866 in horses and 0.864 in cattle. For the postmortem study, the corresponding linear regression was y = 0.082x + 0.268 for horses, and y = 0.082 + 0.290 for cattle (Fig. 4). In the in vivo study, the IOP values measured by the manometer were 25.1 ± 2.9 mmHg (range, 19.0~30.0 mmHg) in horses (Table 1) and 19.7 ± 1.2 mmHg (range, 18.0~22.0) in cattle (Table 2). In the in vivo study, the mean IOP measured by the Perkins tonometer was 2.2 ± 0.3 (range 1.8~2.6 mmHg) in horses. This value corresponded to 23.4 ± 3.2 mmHg (range, 18.6~28.4 mmHg) according to our calibration curve (Table 1). In cattle (Table 2), the mean IOP measured by the Perkins tonometer was 1.8 ± 0.1 (range 1.6~2.0 mmHg) and corresponded to 18.8 ± 1.7 mmHg (range 15.9~20.8 mmHg) according to our calibration curve.

Bottom Line: IOP was measured postmortem using direct manometry (measured with an aneroid manometer) and tonometry (measured with a Perkins handheld applanation tonometer).In cattle, IOP was found to be 19.7 ± 1.2 mmHg (range 18.0~22.0 mmHg) by manometry and 18.8 ± 1.7 mmHg (range 15.9~20.8 mmHg) by tonometry.Our results demonstrate that the Perkins handheld tonometer could be an additional tool for accurately measuring IOP in equine and bovine eyes.

View Article: PubMed Central - PubMed

Affiliation: Department of Small Animal Medicine, University of Oeste Paulista, Rodovia Raposo Tavares, km 572, CEP 19001-970, Presidente Prudente, Brazil. silviafranco@unoeste.br

ABSTRACT
The objective of this study was to evaluate and validate the accuracy of the Perkins handheld applanation tonometer for measuring intraocular pressure (IOP) in horses and cattle. Both eyes of 10 adult horses and cattle were evaluated in a postmortem study. The eyes from 10 clinically normal adult horses and cattle were also examined after bilateral auriculopalpebral nerve block and topical anesthesia for an in vivo study. IOP was measured postmortem using direct manometry (measured with an aneroid manometer) and tonometry (measured with a Perkins handheld applanation tonometer). The correlation coefficients (r(2)) for the data from the postmortem manometry and Perkins tonometer study were 0.866 for horses and 0.864 for cattle. In the in vivo study, IOP in horses was 25.1 ± 2.9 mmHg (range 19.0~30.0 mmHg) as measured by manometry and 23.4 ± 3.2 mmHg (range 18.6~28.4 mmHg) according to tonometry. In cattle, IOP was found to be 19.7 ± 1.2 mmHg (range 18.0~22.0 mmHg) by manometry and 18.8 ± 1.7 mmHg (range 15.9~20.8 mmHg) by tonometry. There was a strong correlation between the IOP values obtained by direct ocular manometry and the tonometer in both horses and cattle. Our results demonstrate that the Perkins handheld tonometer could be an additional tool for accurately measuring IOP in equine and bovine eyes.

Show MeSH
Related in: MedlinePlus