Contact-flatted measurement of eye stiffness based on force–displacement relationship

Jin Zhang; Jianguo Ma; Xueyong Zhang

doi:10.1117/12.903767

15 November 2011 Contact-flatted measurement of eye stiffness based on force–displacement relationship

Jin Zhang, Jianguo Ma, Xueyong Zhang

Proceedings Volume 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation; 83210K (2011) https://doi.org/10.1117/12.903767
Event: Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 2011, Yunnan, China

Abstract

This paper presents a noninvasive approach in vivo measurement of eye stiffness based on a force–displacement relationship, which is based on a new contact-probe method of simultaneously measuring the static force and displacement. First, a simple spherical eye model is introduced for deriving analytical eye stiffness when a static force is applied to an eye. Next, a measurement system for simultaneously measuring force and displacement when a probe is pressed onto the eye is presented. Static eye stiffness is defined which based on the measured force–displacement relationship. A photoelectric probe transducer acts as displacement detector. A 16-bit single-chip microprocessor with E²PROM in the electronic circuit played the role of a nucleus, which stored the program instructions and the interrelated data. Laboratory experiments were carried out on a simulated eyeball connected to a hydraulic manometer to obtain intraocular pressure at different levels. The experimental results show that the measured eye stiffness nicely matches the analytical result.

Citation Download Citation

Jin Zhang, Jianguo Ma, and Xueyong Zhang "Contact-flatted measurement of eye stiffness based on force–displacement relationship", Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83210K (15 November 2011); https://doi.org/10.1117/12.903767

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