Evaluation of monkey intraocular pressure by rebound tonometer.

Wenhan Yu, Guiqun Cao, Jinghua Qiu, Xuyang Liu, Jia Ma, N. Li, Man Yu, Naihong Yan, Lei Chen, Iok Hou Pang

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20 Scopus citations

Abstract

PURPOSE: To evaluate the usefulness of the TonoVet rebound tonometer in measuring intraocular pressure (IOP) of monkeys. METHODS: The accuracy of the TonoVet rebound tonometer was determined in cannulated eyes of anesthetized rhesus monkeys where IOP was controlled by adjusting the height of a connected perfusate reservoir. To assess the applicability of the equipment through in vivo studies, the diurnal fluctuation of IOP and effects of IOP-lowering compounds were evaluated in monkeys. RESULTS: IOP readings generated by the TonoVet tonometer correlated very well with the actual pressure in the cannulated monkey eye. The linear correlation had a slope of 0.922+/-0.014 (mean+/-SEM, n=4), a y-intercept of 3.04+/-0.61, and a correlation coefficient of r(2)=0.97. Using this method, diurnal IOP fluctuation of the rhesus monkey was demonstrated. The tonometer was also able to detect IOP changes induced by pharmacologically active compounds. A single topical ocular instillation (15 microg) of the rho kinase inhibitor, H1152, produced a 5-6 mmHg reduction (p<0.001) in IOP, lasting at least 4 h. In addition, topical administration of Travatan, a prostaglandin agonist, induced a small transient IOP increase (1.1 mmHg versus vehicle control; p=0.26) at 2 h after treatment followed by a pressure reduction at 23 h (-2.4 mmHg; p<0.05). Multiple daily dosing with the drug produced a persistent IOP-lowering effect. Three consecutive days of Travatan treatment produced ocular hypotension of -2.0 to -2.2 mmHg (p<0.05) the following day. CONCLUSIONS: The rebound tonometer was easy to use and accurately measured IOP in the rhesus monkey eye.

Original languageEnglish
Pages (from-to)2196-2201
Number of pages6
JournalMolecular vision
Volume15
StatePublished - 2009

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    Yu, W., Cao, G., Qiu, J., Liu, X., Ma, J., Li, N., Yu, M., Yan, N., Chen, L., & Pang, I. H. (2009). Evaluation of monkey intraocular pressure by rebound tonometer. Molecular vision, 15, 2196-2201.