15 November 2011 Contact-flatted measurement of eye stiffness based on force–displacement relationship
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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.
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Jin Zhang, Jianguo Ma, 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); doi: 10.1117/12.903767; https://doi.org/10.1117/12.903767
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