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New Instrument
May 2010

Goldmann Applanation Tonometry Free of the Slitlamp

Author Affiliations

Author Affiliations: EyeLab Group, LLC (Dr Cohan and Messrs Flanders and Pearch), and Department of Biostatistics, School of Public Health, University of Michigan (Dr Schork), Ann Arbor.

Arch Ophthalmol. 2010;128(5):628-631. doi:10.1001/archophthalmol.2010.55

A prototype device was developed for using the Goldmann applanation tonometer (GAT) without a slitlamp to make it potentially practical to measure intraocular pressure (IOP) away from the clinic. Inexpensive consumer video components and a small flashlight replaced the microscope and illuminator of the slitlamp in a device that was assembled to use a standard, unmodified GAT. The device was evaluated for IOP measurement by volunteer measurer-subjects, who had no experience using the GAT, on each other and also by volunteers on themselves (self-tonometry). In a single, short training session with the prototype, the naive volunteers learned to measure IOP with the GAT. Other naive volunteers made IOP measurements on themselves with the prototype that were comparable in reliability with those obtained with the prototype by a professional measurer.

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