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Abstract #5637 Published in IGR 2-1
A new induction-based impact method for measuring intraocular pressure
Kontiola AIActa Ophthalmologica Scandinavica 2000; 78: 142-145
PURPOSE: An improved induction-based impact method for measuring intraocular pressure (IOP) is presented. METHODS: A light probe containing a permanent magnet is launched towards the eye using a solenoid. The probe hits the eye and bounces back. The same solenoid, inside which the probe moves, is used to detect the movement and impact of the probe, because the moving magnet induces voltage in the solenoid. In the clinical study, the Goldmann applanation tonometer was used as a standard. Hand-held and fixed tonometers were also compared by means of measurements in pressurized pig eyes. RESULTS: At a low IOP, there is a longer impact time than at a high IOP. A hand-held tonometer causes more variation in impact times, especially at low IOP, than a fixed tonometer. CONCLUSIONS: The new induction-based impact method can be used to measure IOP. When a fixed tonometer is used, there is less variation in impact times.
Dr. A.I. Kontiola, Department of Ophthalmology, Hensinki University Central Hospital, Helsinki, Finland
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
