Evaluation of the Perkins<sup><nobr>®</nobr></sup> handheld applanation tonometer in the measurement of intraocular pressure in dogs and cats期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Evaluation of the Perkins^® handheld applanation tonometer in the measurement of intraocular pressure in dogs and cats

Authors:	Silvia Franco Andrade Tatiana Cremonezi† Cristiane Aparecida Miranda Zachi† Caroline Ferreira Lonchiati† Juliana Dalarrosa Amatuzzi† Keila Priscilla Sakamoto† Paulo Augusto de Arruda Mello‡

Institution:	Department of Small Animal Medicine, Veterinary Hospital, University of Oeste Paulista (UNOESTE), Rodovia Raposo Tavares, km 572, CEP 19001-970, Presidente Prudente, SP, Brazil;;Faculty of Veterinary Medicine, University of Oeste Paulista, Presidente Prudente, SP, Brazil;;Department of Ophthalmology, Faculty of Medicine, University Federal of São Paulo (UNIFESP), São Paulo, SP, Brazil

Abstract:	Objective To evaluate and to validate the accuracy of the Perkins^® handheld applanation tonometer in the measurement of IOP in dogs and cats. Animals Twenty eyes from 10 dogs and 10 cats immediately after sacrifice were used for the postmortem study and 20 eyes from 10 clinically normal and anesthetized dogs and cats were used for the in vivo study. Both eyes of 20 conscious dogs and cats were also evaluated. Procedure Readings of IOP postmortem and in vivo were taken using manometry (measured with a mercury column manometer) and tonometry (measured with a Perkins^® handheld applanation tonometer). The IOP measurement with Perkins^® tonometer in anesthetized and conscious dogs and cats was accomplished by instillation of proxymetacaine 0.5% and of 1% fluorescein eye drops. Results The correlation coefficient ( r ²) between the manometry and the Perkins^® tonometer were 0.982 (dogs) and 0.988 (cats), and the corresponding linear regression equation were y = 0.0893 x + 0.1105 (dogs) and y = 0.0899 x + 0.1145 (cats) in the postmortem study. The mean IOP readings with the Perkins^® tonometer after calibration curve correction were 14.9 ± 1.6 mmHg (range 12.2–17.2 mmHg) in conscious dogs, and were 15.1 ± 1.7 mmHg (range 12.1–18.7 mmHg) in conscious cats. Conclusion There was an excellent correlation between the IOP values obtained from direct ocular manometry and the Perkins^® tonometer in dogs and cats. The Perkins^® handheld tonometer could be in the future a new alternative for the diagnosis of glaucoma in veterinary ophthalmology.

Keywords:	applanation tonometer cats dogs intraocular pressure ocular manometry Perkins tonometer

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