CONTINUOUS RECORDING OF THE INTRAOCULAR PRESSURE IN HUMAN AND RABBIT EYES WITH A SIMPLE APPLANATING SUCTION CUP

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Abstract
A suction cup was devised to fit the periphery of the cornea and applanate its central part. A slow, continuous saline infusion entering through a central opening forms a disc of fluid between applanating and applanated surface in which the pressure (Pcup) was followed by a conventional transducer. The saline left the periphery of the cup via a hanging tube creating a suction pressure of approximately 15 mmHg, which kept the cup on the cornea. In human cadaver eyes the relation between intraocular pressure (P0) and Pcup was P0 = 0.80 .times. Pcup-2.3 (mmHg), r = 0.9986. In enucleated rabbit eyes: P0 = 0.94 .times. Pcup-0.1 (mmHg), r = 0.9996. Thus, with appropriate calibration of the recorder, the cup functions both accurately and linearly. The relationships were virtually uninfluenced by large changes in both the rate of suction and the inflow rate of saline. When measuring on eyes of patients, the cup was atraumatic and gave an excellent dynamic response.

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