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Abstract #20480 Published in IGR 10-1
Contact-based stiffness sensing of human eye
Kurita Y; Kempf R; Iida Y; Okude J; Kaneko M; Mishima HK; Tsukamoto H; Sugimoto E; Katakura S; Kobayashi KIEEE Transactions on Bio-Medical Engineering 2008; 55: 739-745
Goldmann applanation tonometry is commonly used for measuring intraocular pressure (IOP) to diagnose glaucoma. However, the measured IOP by conventional applanation tonometry is valid only under the assumption that all subjects have the same structural eye stiffness. This paper challenges in vivo measurement of eye stiffness with a noninvasive approach and investigates individual differences of eye stiffness. Eye stiffness is defined by the applied force and displacement of the cornea. The displacement is detected based on captured images by a high resolution camera. The experimental results show that the measured stiffness nicely matches the analytical result that is derived from a simple spherical deformation model with an internal pressure. However, some subjects have different eye stiffness even with the same IOP. IOP with abnormal stiffness may be over/underestimated by conventional applanation tonometry. The proposed eye stiffness measurement can help detect the misestimated eye and it contributes to the early detection of glaucoma.
Dr. Y. Kurita, Graduate School of Information Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-chou, Ikoma, Nara 6300101, Japan. kurita@is.naist.jp
Classification:
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)
6.1.3 Factors affecting IOP (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)
