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Abstract #6690 Published in IGR 4-1
Technical solution for direct measurement of intraocular perfusion pressure
Draeger J; Rumberger ESpektrum der Augenheilkunde 2002; 16: 8-10
The ocular perfusion pressure (PP) as the difference between pressure in retinal artery (PAR) and the intraocular pressure (IOP) is an important factor of sufficient oxygen supply of retinal tissue. Constant or intermittent reduction of PP either by elevation of IOP or be decreasing of PAR may be the essential cause of glaucoma. A decisive cause of elevation of IOP may be decreasing facility of outflow (FO). Measuring the IOP is an ophthalmological standard procedure, but assessments of PAR and FO are more complicated methods. Early diagnosis of glaucoma may be improved by easy and simultaneous assessment of PAR, IOP and FO. The authors have developed a new instrument for tonometry, tonography, and ophthalmodynamometry. This instrument is based on the principle of applanation tonometry. An electric motor moves an applanation body against the eye, the cornea is applanated and thus IOP is successively elevated. A sensor in the center of the applanation area continuously registers the actual IOP. A second forced sensor positioned between the motor and the applanation body registers the force necessary to produce a given applanation area. The quotient force/actual IOP allows the applanation area to be assessed. The actual values of force and pressure are evaluated to drive or stop the motor.LA: German
Dr. J. Draeger, Universitats-Augenklinik, Martinistrasse 52, D-20246 Hamburg, Germany
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
