Comparison of MacKay-Marg, Goldmann, and Perkins tonometers in abnormal corneas
F. McMillan and R. K. Forster
Intraocular pressure was determined manometrically in owl monkey eyes with
normal and edematous corneas. The pressure was measured with Perkins
hand-held, Goldmann, and MacKay-Marg tonometers to compare relative
accuracy. At monometric levels of 20, 30, and 40 mm Hg, a statistically
significant difference in readings was found between normal and edematous
corneas with use of the Perkins and Goldmann applanators, whereas no such
difference was found with the MacKay-Marg tonometer. The MacKay-Marg
tonometer most closely approximated the true intraocular pressure in
edematous corneas.
