title: Intraocular pressure in normal dairy cattle.
abstract: Intraocular pressure (IOP) was measured in normal dairy cows by applanation tonometry. In the first study of 15 Holstein and 17 Jersey cows the mean IOP by Mackay-Marg tonometry was 27.5 +/- 4.8 mmHg (range 16-39 mmHg); no significant differences (P < 0.92) were observed between the Holstein and Jersey breeds. In the second study of 15 Holstein and 12 Jersey cows, the mean IOPs by Mackay-Marg and TonoPen-XL tonometry were 28.2 +/- 4.6 mmHg (range 19-39 mmHg) and 26.9 +/- 6.7 mmHg (range 16-42 mmHg), respectively. Comparisons of the Mackay-Marg and TonoPen tonometers indicated no significant differences (P < 0.16). The mean and range of IOP in normal dairy cows within 2 SD (95% of the population) is 27 mmHg with a range of 16-36 mmHg.
authors.affiliation: Pharmaceutical Development, B. Braun Medical/McGaw, Inc., Irvine, CA, USA; Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610-0126, USA; Sunset Meadows Country Animal Hospital, Gainesville, Fl 32606, USA; Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610-0126, USA.
authors.forename: G.G.
authors.initials: GG
authors.lastname: Gum
authors.forename: K.N.
authors.initials: KN
authors.lastname: Gelatt
authors.forename: D.N.
authors.initials: DN
authors.lastname: Miller
authors.forename: E.O.
authors.initials: EO
authors.lastname: MacKay