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June 1975

Comparison of MacKay-Marg, Goldmann, and Perkins Tonometers in Abnormal Corneas

Author Affiliations

From the Bascom Palmer Eye Institute, Department of Ophthalmology, University of Miami (Fla) School of Medicine. Dr. McMillan is now located in Jackson, Miss.

Arch Ophthalmol. 1975;93(6):420-424. doi:10.1001/archopht.1975.01010020434007

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 manometric 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.

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