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Impact of Cephalic Index on Intraocular Pressure as Measured by Rebound Tonometry in Ophthalmologically Normal Dogs
Mary Evelyn Pearsall1, Renata Ramos1, Ian Herring1
1Virginia Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA.
Purpose:
The purpose of this study was to determine whether cephalic index (CI) affects intraocular pressure (IOP) measurement using rebound tonometry.
Methods:
33 client-owned dogs were included. Measurements of skull length and width were taken using calipers, and CI was calculated as (skull width (mm) x 100)/(skull length (mm)). IOP measurements were taken using rebound tonometry (iCare TonoVet).
Results:
33 dogs were included in this study. CI ranged from 45-105, with an average of 63. Measured IOP was not impacted by CI (p = 0.2604).
Conclusions:
No effect of CI was detected when using the TonoVet to measure IOP. A larger study may be necessary to determine if CI affects IOP using various methods of IOP measurement.
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