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Abstract #11485 Published in IGR 6-3
Dynamic contour tonometry: a comparative study on human cadaver eyes
Kniestedt C; Nee M; Stamper RLArchives of Ophthalmology 2004; 122: 1287-1293
OBJECTIVE: To compare intraocular pressure measurements obtained by recently introduced dynamic contour tonometry (DCT), Goldmann applanation tonometry (GAT), pneumatonometry (PTG), and intracameral manometry in human cadaver eyes. METHODS: Sixteen freshly enucleated human cadaver eyes were deepithelialized and dehydrated with dextran. A tube was placed in the anterior chamber and connected to a transducer and to a bottle system filled with balanced salt solution. The pressure in the eye was then altered between 5 mmHg and 58 mmHg. Intraocular pressure measurements were obtained with DCT, GAT, and PTG at each manometric pressure reading. RESULTS: On average, DCT values measured 0.58 ± 0.70 mmHg higher than real intracameral pressure. The GAT and PGT showed consistently lower values, -4.01 ± 1.76 mmHg and -5.09 ± 2.61 mmHg, respectively. At all bottle heights, DCT values were significantly closer to the reference pressure than GAT and PTG (P < .001). CONCLUSIONS: Measurement with DCT provides IOP values significantly closer to true manometric levels than either GAT or PTG. Further studies are warranted to determine its reliability in patients and the effect of corneal thickness.
Dr. C. Kniestedt, Department of Ophthalmology, University of California-San Francisco, 10 Kirkham Street, San Francisco, CA 94143, USA
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
