TY - JOUR
T1 - Noninvasive measurement of rodent intraocular pressure with a rebound tonometer
AU - Wang, Wan Heng
AU - Millar, J. Cameron
AU - Pang, Iok Hou
AU - Wax, Martin B.
AU - Clark, Abbot F.
PY - 2005/12
Y1 - 2005/12
N2 - PURPOSE. The present study evaluated the applicability of a rebound tonometer in measuring intraocular pressure (IOP) in rats and mice. METHODS. The accuracy of the TonoLab rebound tonometer was determined in cannulated mouse and rat eyes. IOP was manipulated by changing reservoir height, and tonometer pressure readings were recorded by an independent observer. IOP values were recorded in conscious Wistar rats and in four different strains of mice. The effects of anesthesia on IOP were evaluated in two different strains of mice. RESULTS. The IOP readings generated by the rebound tonometer correlated very well with the actual pressure in the eye. In rats, this linear correlation had a slope of 0.96 ± 0.05 (mean ± SEM, n = 4) and a Y-intercept of -2.1 ± 1.2. In mice, the slope was 0.99 ± 0.05 (n = 3), and the Y-intercept was 0.8 ± 1.4. Using this method, the resting IOP of conscious male Wistar rats was observed to be 18.4 ± 0.1 mm Hg (n = 132). In mice, strain differences in IOP were detected. Baseline IOP values in Balb/c, C57-BL/6, CBA, and 11- to 12-month-old DBA/2J mice were 10.6 ± 0.6, 13.3 ± 0.3, 16.4 ± 0.3, and 19.3 ± 0.4 mm Hg (n = 12), respectively. In separated studies, anesthesia lowered IOP from 14.3 ± 0.9 to 9.2 ± 0.5 mm Hg (n = 8) in C57-BL/6 mice, and from 16.6 ± 0.4 to 9.4 ± 0.6 mm Hg (n = 10) in CBA mice. CONCLUSIONS. The rebound tonometer was easy to use and accurately measured IOP in rats and mice. This technique, together with advances in genetic and other biological studies in rodents, will be valuable in the further understanding of the etiology and pathology of glaucoma.
AB - PURPOSE. The present study evaluated the applicability of a rebound tonometer in measuring intraocular pressure (IOP) in rats and mice. METHODS. The accuracy of the TonoLab rebound tonometer was determined in cannulated mouse and rat eyes. IOP was manipulated by changing reservoir height, and tonometer pressure readings were recorded by an independent observer. IOP values were recorded in conscious Wistar rats and in four different strains of mice. The effects of anesthesia on IOP were evaluated in two different strains of mice. RESULTS. The IOP readings generated by the rebound tonometer correlated very well with the actual pressure in the eye. In rats, this linear correlation had a slope of 0.96 ± 0.05 (mean ± SEM, n = 4) and a Y-intercept of -2.1 ± 1.2. In mice, the slope was 0.99 ± 0.05 (n = 3), and the Y-intercept was 0.8 ± 1.4. Using this method, the resting IOP of conscious male Wistar rats was observed to be 18.4 ± 0.1 mm Hg (n = 132). In mice, strain differences in IOP were detected. Baseline IOP values in Balb/c, C57-BL/6, CBA, and 11- to 12-month-old DBA/2J mice were 10.6 ± 0.6, 13.3 ± 0.3, 16.4 ± 0.3, and 19.3 ± 0.4 mm Hg (n = 12), respectively. In separated studies, anesthesia lowered IOP from 14.3 ± 0.9 to 9.2 ± 0.5 mm Hg (n = 8) in C57-BL/6 mice, and from 16.6 ± 0.4 to 9.4 ± 0.6 mm Hg (n = 10) in CBA mice. CONCLUSIONS. The rebound tonometer was easy to use and accurately measured IOP in rats and mice. This technique, together with advances in genetic and other biological studies in rodents, will be valuable in the further understanding of the etiology and pathology of glaucoma.
UR - http://www.scopus.com/inward/record.url?scp=33644805812&partnerID=8YFLogxK
U2 - 10.1167/iovs.05-0781
DO - 10.1167/iovs.05-0781
M3 - Article
C2 - 16303957
AN - SCOPUS:33644805812
SN - 0146-0404
VL - 46
SP - 4617
EP - 4621
JO - Investigative Ophthalmology and Visual Science
JF - Investigative Ophthalmology and Visual Science
IS - 12
ER -