Variation in intraocular pressure following application of tropicamide in three different dog breeds

Abstract

To record intraocular pressure (IOP) of three different dog breeds following administration of one drop of 1% tropicamide. Three dog breeds - Golden Retrievers (n = 20), Siberian Huskies (n = 20) and English Cocker Spaniels (n = 36) - were studied. IOPs were measured using a Tonopen following corneal anesthesia with a single drop of 0.5% proxymetacaine. A drop of 0.5% tropicamide was then administered bilaterally and a second IOP measurement was taken 30 min later (postdilation). The difference between the two measurements was considered as the effect of mydriasis on IOP. Dogs had an average IOP of 14.9 ± 3.2 mmHg, with 95% confidence limits ranging from 8 to 22 mmHg. There were significant ..