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February 1974

A Noncontact Applanation TonometerDescription and Clinical Evaluation

Author Affiliations

New York; Framingham, Mass
From the Edward S. Harkness Eye Institute, Columbia-Presbyterian Medical Center, New York (Drs. Forbes and Pico) and American Optical Corporation, Framingham, Mass (Mr. Grolman).

Arch Ophthalmol. 1974;91(2):134-140. doi:10.1001/archopht.1974.03900060140012

A new applanation tonometer (NCT) measures intraocular pressure without touching the eye. A central area of the cornea is deformed by an air-pulse of linearly increasing force and the instant of applanation is determined by a monitoring system that senses light reflected from the corneal surface. Clinical evaluation has demonstrated good correlation between NCT and Goldmann tonometer readings, thereby validating this new method of tonometry.