Active noncontact tonometer for glaucoma detection

Yanmei Han; Peter John Bryanston-Cross; Wing Kai A. Lee; Mark Hero

doi:10.1117/12.482946

12 September 2002 Active noncontact tonometer for glaucoma detection

Yanmei Han, Peter John Bryanston-Cross, Wing Kai A. Lee, Mark Hero

Proceedings Volume 4916, Optics in Health Care and Biomedical Optics: Diagnostics and Treatment; (2002) https://doi.org/10.1117/12.482946
Event: Photonics Asia, 2002, Shanghai, China

Abstract

Glaucoma is an increasingly common cause of visual impairment, and in some cases causes blindness. The approach to develop a low cost and non-contact tonometer for the detection of glaucoma, to replace the Goldmann tonometer used worldwide, is presented in this paper. The new tonometer exploits the vibration property of the cornea - the resonance frequency of the cornea rises with increasing intra-ocular pressure (IOP). An audio frequency signal is used to vibrate the cornea of the eye, the vibration of the cornea is measured using a fibre optic lever probe, and then the IOP can be calculated from the detected resonance frequency of the cornea. The initial PC-version experiment system of the new tonometer has been demonstrated and preliminary testing has been performed, showing a suitable sensitivity in detecting the resonance frequency against the IOP using both the simulated-eye model and the pig’s eye. The initial system has been improved to be suitable for greater than 15mm detecting distance, and the measurement of vibrations of human cornea in-vivo has been carried out. Work is now focusing on increasing the sensitivity of the fibre probe, and reducing the measuring time to less than 1 second.

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Yanmei Han, Peter John Bryanston-Cross, Wing Kai A. Lee, and Mark Hero "Active noncontact tonometer for glaucoma detection", Proc. SPIE 4916, Optics in Health Care and Biomedical Optics: Diagnostics and Treatment, (12 September 2002); https://doi.org/10.1117/12.482946

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KEYWORDS

Eye

Cornea

Signal detection

Fiber optics

Light emitting diodes

Calibration

Distance measurement

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